Applied Cryptography

Chuck Frank

Northern Kentucky University

CSC 382/682 Cryptography & Computer Security CSC 382 - Upper level undergraduates

CSC 682 – MSCS students

Cryptography is approximately 1/3 of the course

Why Cryptography?

Powerful tool for keeping data and communications secure

Cryptography properly applied lessen security threats.

Goals

Students should be able to apply cryptography in the software they will develop.

Students should be able to apply cryptography in the systems they will manage.

Incorporating Cryptographyinto Programs Reference:

Garns & Somerfield, Professional Java Security, Wrox Press

Java Cryptography Extension (JCE)

Java Cryptography

Look at a variety of Java cryptography applications

Assign several small Java programs including a network application

Incorporating Cryptography into Computer Systems Kaufman, Perlman, Speciner, Network

Security, 2nd edition, Prentice Hall

Knowledge of Modern Cryptography Secret Key Cryptography

Public Key Cryptography

Hashing and Message Digests

Protocols

Secret Key Cryptography

What is it?

Basic understanding of algorithmsDESTriple-DESRijndael

Public Key Cryptography

What is it?

AlgorithmsRSADiffie Hellman

Hashes and Message Digest

Why is useful?

Basic understanding of algorithmsMD5SHA-1

Tripwire

Protocols

SSL/TSLUsed for e-commercePublic key for key exchangeSecret key for encryption

IPSecUse for VPNs

Mathematical Background

Student have had 10 hours of calculus & discrete math

Cover sufficient number theoryModular arithmetic & Euler’s theoremTo understand RSAGeneration of probable primes

Not Covered

Classical, yet obsolete, ciphersCaesar, Vigenére

History of cryptography