12

Symmetric-Key Cryptography CS 161: Computer Security Prof. David Wagner March 12, 2013

Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Download PDF Report

Upload
phungkhanh
View
233
Download
0

Embed Size (px)

Citation preview

Page 1: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Symmetric-Key Cryptography

CS 161: Computer Security Prof. David Wagner

March 12, 2013

Page 2: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

P1 P2 P3

C1 C2 C3

Page 3: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

P1 P2 P3

C1 C2 C3

Page 4: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Original image

Page 5: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Encrypted with ECB

Page 6: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Later (identical) message again encrypted with ECB

Page 7: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

P1 P2 P3

C1 C2 C3

Page 8: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

P1 P2 P3

C1 C2 C3

Page 9: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Original image

Page 10: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

Encrypted with CBC

Page 11: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

(Nonce = Same as IV)

C1 C2 C3

P1 P2 P3

Page 12: Symmetric-Key Cryptographycs161/sp14/slides/3.12.Symmetric.pdf · Symmetric-Key Cryptography ... Original image . ... CTR decryption uses block cipher’s encryption functionality,

(Note, CTR decryption uses block cipher’s encryption functionality, not decryption)

C1 C2 C3

P1 P2 P3

Amortized Threshold Symmetric-key Encryption

Amortized Threshold Symmetric-key Encryption

Documents

Lecture 10: Key Distribution for Symmetric Key Lecture ... · Lecture 10: Key Distribution for Symmetric Key Cryptography and Generating Random Numbers Lecture Notes on “Computer

Lecture 10: Key Distribution for Symmetric Key Lecture ... · Lecture 10: Key Distribution for Symmetric Key Cryptography and Generating Random Numbers Lecture Notes on “Computer

Documents

Symmetric-Key Encryption

Symmetric-Key Encryption

Documents

symmetric key encryption algorithms

symmetric key encryption algorithms

Engineering

Different types of Symmetric key Cryptography

Different types of Symmetric key Cryptography

Software

Introduction to Modern Symmetric-key Ciphers

Introduction to Modern Symmetric-key Ciphers

Documents

Symmetric and Asymmetric Ciphers. Symmetric Encryption or conventional / private-key / single-key sender and recipient share a common key all classical

Symmetric and Asymmetric Ciphers. Symmetric Encryption or conventional / private-key / single-key sender and recipient share a common key all classical

Documents

Symmetric Key Thesis Ece

Symmetric Key Thesis Ece

Documents

1 Overview of Cryptography. Contents Introduction Symmetric-key cryptography Block ciphers Symmetric-key algorithms Cipher block modes Stream cipher Public-key

1 Overview of Cryptography. Contents Introduction Symmetric-key cryptography Block ciphers Symmetric-key algorithms Cipher block modes Stream cipher Public-key

Documents

Encipherment Using Modern Symmetric-Key Ciphers

Encipherment Using Modern Symmetric-Key Ciphers

Documents

Symmetric Key Structural Residues in Symmetric Proteins with Beta

Symmetric Key Structural Residues in Symmetric Proteins with Beta

Documents

Chapter 3 Traditional Symmetric-Key Ciphers · PDF fileIIffPPiiss tthhee plaintext,plaintext, CCiiss tthhee ciphertextciphertext, andandKK iiss tthhee key,key, Traditional Symmetric-Key

Chapter 3 Traditional Symmetric-Key Ciphers · PDF fileIIffPPiiss tthhee plaintext,plaintext, CCiiss tthhee ciphertextciphertext, andandKK iiss tthhee key,key, Traditional Symmetric-Key

Documents

Symmetric Key cryptosystem

Symmetric Key cryptosystem

Documents

Symmetric key encryption new approach

Symmetric key encryption new approach

Technology

Symmetric)Key+Cryptographycs161/sp16/slides/2.22.symmetric.pdf · for*encryption*bythemselves? • Can*onlyencrypt*messagesof*a*certain* ... knowsit*isthe*same*message. Original*image

Symmetric)Key+Cryptographycs161/sp16/slides/2.22.symmetric.pdf · for*encryption*bythemselves? • Can*onlyencrypt*messagesof*a*certain* ... knowsit*isthe*same*message. Original*image

Documents

SYMMETRIC SPECTRA - Dept of Math, Stat, & Comp Scibshipley/symmetric.pdf · 2004. 7. 8. · SYMMETRIC SPECTRA 151 with a pointed actionofthe permutation group n onX n andequivariantstructure

SYMMETRIC SPECTRA - Dept of Math, Stat, & Comp Scibshipley/symmetric.pdf · 2004. 7. 8. · SYMMETRIC SPECTRA 151 with a pointed actionofthe permutation group n onX n andequivariantstructure

Documents

Symmetric Key Cryptography - cdn.ttgtmedia.com · Symmetric Key Cryptography Symmetric key ciphers are one of the workhorses of cryptography. They are used to secure bulk data, provide

Symmetric Key Cryptography - cdn.ttgtmedia.com · Symmetric Key Cryptography Symmetric key ciphers are one of the workhorses of cryptography. They are used to secure bulk data, provide

Documents

Symmetric Key Primitives II

Symmetric Key Primitives II

Documents

Symmetric Key Cryptographystek/slides/pqsymcrypt.pdf · Symmetric Key Cryptography ... DTUCompute,TechnicalUniversityofDenmark. Introduction to Symmetric Key Cryptography. ... JohannesA.Buchmann,ErikDahmen

Symmetric Key Cryptographystek/slides/pqsymcrypt.pdf · Symmetric Key Cryptography ... DTUCompute,TechnicalUniversityofDenmark. Introduction to Symmetric Key Cryptography. ... JohannesA.Buchmann,ErikDahmen

Documents

Symmetric key cryptography - BME-HITbuttyan/courses/Revkomarom/symmetric-enc.pdf1 Symmetric key cryptography - preliminaries (operational and attacker models) - block ciphers (basics,

Symmetric key cryptography - BME-HITbuttyan/courses/Revkomarom/symmetric-enc.pdf1 Symmetric key cryptography - preliminaries (operational and attacker models) - block ciphers (basics,

Documents

A securing symmetric key distribution

A securing symmetric key distribution

Internet

Using Modern Symmetric-Key Ciphers

Using Modern Symmetric-Key Ciphers

Documents

SYMMETRIC CRYPTOGRAPHY THE BASICS. SYMMETRIC CRYTPOGRAPHY Symmetric key cryptography literally means that the same key is used to encrypt the message

SYMMETRIC CRYPTOGRAPHY THE BASICS. SYMMETRIC CRYTPOGRAPHY Symmetric key cryptography literally means that the same key is used to encrypt the message

Documents

12 symmetric key cryptography

12 symmetric key cryptography

Documents

Symmetric Key Aditya VAIO

Symmetric Key Aditya VAIO

Documents

Key Management and Distribution - t Uict.siit.tu.ac.th/~steven/css322y10s2/unprotected/... · CSS322 Key Management Key Distribution Symmetric with Symmetric Symmetric with Asymmetric

Key Management and Distribution - t Uict.siit.tu.ac.th/~steven/css322y10s2/unprotected/... · CSS322 Key Management Key Distribution Symmetric with Symmetric Symmetric with Asymmetric

Documents

Symmetric Lenses - University of Pennsylvaniabcpierce/papers/symmetric.pdf · Symmetric Lenses Martin Hofmann Ludwig-Maximilians-Universitat¨ Benjamin Pierce University of Pennsylvania

Symmetric Lenses - University of Pennsylvaniabcpierce/papers/symmetric.pdf · Symmetric Lenses Martin Hofmann Ludwig-Maximilians-Universitat¨ Benjamin Pierce University of Pennsylvania

Documents

Modern Symmetric Key Cipher

Modern Symmetric Key Cipher

Documents

CSCE 790 Secure Computer Systems Asymmetric Cryptography · Symmetric vs. Asymmetric Encryption • Symmetric encryption – Also called symmetric-key / secret-key / shared-key encryption

CSCE 790 Secure Computer Systems Asymmetric Cryptography · Symmetric vs. Asymmetric Encryption • Symmetric encryption – Also called symmetric-key / secret-key / shared-key encryption

Documents

3.traditional symmetric key ciphers

3.traditional symmetric key ciphers

Education