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Algorithmic Cryptography (WS2017/18)Chapter 1
Motivation and Symmetric Systems
Walter Unger
Lehrstuhl fr Informatik 1
0:59 , October 12, 2017
Motivation from History and Basics DES IDEA AES Finally
1 Inhaltsverzeichnis Walter Unger 12.10.2017 0:59 WS2017/18Z
Contents I
1 Motivation from History and BasicsHistory before the Common EraHistory till 1900From 1900 till 1950Basics
2 DESIntroductionConvertion of the KeyModes of Operation
3 IDEAIdeaThe SystemDecryption
4 AESIdeaThe System
5 FinallySystem without SystemModern Attacks
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 1/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 2/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash
Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 3/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar
Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 4/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr.
Skytale
Atbash Caesar
Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 5/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar
Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 6/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 7/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 8/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson
Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 9/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 10/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 11/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 12/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 13/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 14/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 15/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 16/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 17/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:1 History before the Common Era 18/18 Walter Unger 12.10.2017 0:59 WS2017/18Z
The Early Beginning
First references about 1900 BCE by Egyptians: strange hieroglyphics.
Atbash: Hebrew cipher, about 600 BCE in Palestine.
Caesar: cipher, which was presumably used by Caesar.
Ciphering started with the development of writing.
AES
IDEA
DES
str.H.gly.
M-209
Enigma
Hill
One-Time Pad
Steg.gr. Skytale
Atbash Caesar Alkindus
Phelippes
Vigenere
Jefferson Kasiski
Babbage
Playfair
-2000 -1500 -1000 -500 0 500 1000 1500 2000
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 1/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
z
b
y
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v
f
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t
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p
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a
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l
o
i
r
n
m
d
w
r
i
o
l
m
n
x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 2/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
z
b
y
c
x
d
w
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v
f
u
g
t
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p
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l
o
i
r
n
m
d
w
r
i
o
l
m
n
x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 3/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
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b
y
c
x
d
w
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f
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g
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p
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a
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l
o
i
r
n
m
d
w
r
i
o
l
m
n
x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 4/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
z
b
y
c
x
d
w
e
v
f
u
g
t
h
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j
q
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q
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p
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l
o
i
r
n
m
d
w
r
i
o
l
m
n
x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 5/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
z
b
y
c
x
d
w
e
v
f
u
g
t
h
s
i
r
j
q
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q
j
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i
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v
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a
p
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a
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l
o
i
r
n
m
d
w
r
i
o
l
m
n
x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 6/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
z
b
y
c
x
d
w
e
v
f
u
g
t
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o
i
r
n
m
d
w
r
i
o
l
m
n
x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 7/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
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y
c
x
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w
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t
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i
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m
d
w
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i
o
l
m
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x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 8/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
z
b
y
c
x
d
w
e
v
f
u
g
t
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o
i
r
n
m
d
w
r
i
o
l
m
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x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 9/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
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y
c
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f
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g
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o
i
r
n
m
d
w
r
i
o
l
m
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x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 10/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
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c
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i
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m
d
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i
o
l
m
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x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:2 History before the Common Era 11/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Atbash (about 600 BCE)
a
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y
c
x
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v
f
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t
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o
i
r
n
m
d
w
r
i
o
l
m
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x 7 n 1 x mit x {0, . . . , n 1}
str.H.gly.
Atbash-600
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 1/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 2/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 3/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 4/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 5/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 6/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 7/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 8/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 9/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 10/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 11/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 12/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 13/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 14/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:3 History before the Common Era 15/15 Walter Unger 12.10.2017 0:59 WS2017/18Z
Steganography
Example from ancient times:
Greece against Persia inthe 5th century BCE.
Xerxes against Athensand Sparta.
Whistle-blower:Demaratos from Susa.
Message on a woodenboard covered by wax.
Naval battle at 23rd Sep.480 BCE at the bay ofSalamis.
More possibilities for hiddenmessages:
Written skin below thehair of the head,
Message on silk, whichwas swallowed as a ballof wax,
Secret compartments,
invisible inks,
Microdots and more.
str.H.gly.
Steg.gr.
Atbash
-480
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 1/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 2/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 3/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)
The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 4/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 5/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.
2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 6/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.
3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 7/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.
4 For the decoding wind the strap on a stick of the samesize.
5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 8/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.
5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 9/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 10/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:4 History before the Common Era 11/11 Walter Unger 12.10.2017 0:59 WS2017/18Z
Skytale
Greek cipher (Sparta)The encoding:
1 Wind a strap around a stick.2 Write a message on the strap.3 The letters are now mixed on the strap.4 For the decoding wind the strap on a stick of the same
size.5 Read the message
The letters are transposed by this cipher.
str.H.gly.
Steg.gr.
Skytale
Atbash
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 1/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 2/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 3/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 4/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 5/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
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o
m
p
n
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y
w
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x
a
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b
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c
s
v
c
f
h
k
l
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a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 6/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
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m
p
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t
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v
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w
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x
a
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c
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v
c
f
h
k
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a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 7/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
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v
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y
w
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x
a
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b
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c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 8/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
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p
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q
t
r
u
s
v
t
w
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x
v
y
w
z
x
a
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b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 9/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
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p
s
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t
r
u
s
v
t
w
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x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 10/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
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x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 11/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 12/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:5 History before the Common Era 13/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Csar
a
d
b
e
c
f
d
g
e
h
f
i
g
j
h
k
i
l
j
m
k
n
l
o
m
p
n
q
o
r
p
s
q
t
r
u
s
v
t
w
u
x
v
y
w
z
x
a
y
b
z
c
s
v
c
f
h
k
l
o
a
d
r
u
a
d
f
i
f
i
e
h
n
q
x 7 x + k mod n mit x {0, . . . , n 1}
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar -50
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 1/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 2/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 3/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 4/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 5/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 6/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 7/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 8/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 9/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 10/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 11/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 12/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:6 History before the Common Era 13/13 Walter Unger 12.10.2017 0:59 WS2017/18Z
Affine System
a
j
b
q
c
x
d
e
e
l
f
s
g
z
h
g
i
n
j
u
k
b
l
i
m
p
n
w
o
d
p
k
q
r
r
y
s
f
t
m
u
t
v
a
w
h
x
o
y
v
z
c
s
f
c
x
h
g
l
i
a
j
r
y
a
j
f
s
f
s
e
l
n
w
x 7 x a + b mod n mit gcd(n, a) = 1
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 1/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 2/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 3/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 4/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 5/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 6/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 7/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 8/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 9/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
Motivation from History and Basics DES IDEA AES Finally
1:7 History before the Common Era 10/24 Walter Unger 12.10.2017 0:59 WS2017/18Z
Keyword Caesar
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
w
p
x
q
y
s
z
u
a
v
b
x
c
y
d
z
e
w
f
a
g
l
h
t
i
e
j
r
k
b
l
c
m
d
n
f
o
g
p
h
q
i
r
j
s
k
t
m
u
n
v
o
x 7 (x)
str.H.gly.
Steg.gr.
Skytale
Atbash
Caesar
-2000
-1900
-1800
-1700
-1600
-1500
-1400
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300