Applied Cryptography

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Applied Cryptography

• Chuck Frank
• Northern Kentucky University

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CSC 382/682 Cryptography Computer Security

• CSC 382 - Upper level undergraduates
• CSC 682 MSCS students
• Cryptography is approximately 1/3 of the course

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Why Cryptography?

• Powerful tool for keeping data and communications
  secure
• Cryptography properly applied lessen security
  threats.

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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.

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Incorporating Cryptographyinto Programs

• Reference
• Garns Somerfield, Professional Java Security,
  Wrox Press
• Java Cryptography Extension (JCE)

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Java Cryptography

• Look at a variety of Java cryptography
  applications
• Assign several small Java programs including a
  network application

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Incorporating Cryptography into Computer Systems

• Kaufman, Perlman, Speciner, Network Security, 2nd
  edition, Prentice Hall

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Knowledge of Modern Cryptography

• Secret Key Cryptography
• Public Key Cryptography
• Hashing and Message Digests
• Protocols

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Secret Key Cryptography

• What is it?
• Basic understanding of algorithms
• DES
• Triple-DES
• Rijndael

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Public Key Cryptography

• What is it?
• Algorithms
• RSA
• Diffie Hellman

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Hashes and Message Digest

• Why is useful?
• Basic understanding of algorithms
• MD5
• SHA-1
• Tripwire

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Protocols

• SSL/TSL
• Used for e-commerce
• Public key for key exchange
• Secret key for encryption
• IPSec
• Use for VPNs

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Mathematical Background

• Student have had 10 hours of calculus discrete
  math
• Cover sufficient number theory
• Modular arithmetic Eulers theorem
• To understand RSA
• Generation of probable primes

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Not Covered

• Classical, yet obsolete, ciphers
• Caesar, Vigenére
• History of cryptography