Introduction to Information Security


Applied Cryptanalysis: Overview



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Applied Cryptanalysis: Overview

  • Classic (pen and paper) ciphers
    • Transposition, substitution, etc.
    • Same principles appear in later sections
  • World War II ciphers
    • Enigma, Purple, Sigaba
  • Stream ciphers
    • Shift registers, correlation attack, ORYX, RC4, PKZIP

Applied Cryptanalysis: Overview

  • Block ciphers
    • Hellman’s TMTO, CMEA, Akelarre, FEAL
  • Hash functions
    • Nostradamus attack, MD4, MD5
  • Public key crypto
    • Knapsack, Diffie-Hellman, Arithmetica, RSA, Rabin, NTRU, ElGamal
    • Factoring, discrete log, timing, glitching

Why Study Cryptography?

  • Information security is a big topic
    • Crypto, Access control, Protocols, Software
    • Real world info security problems abound
  • Cryptography is the part of information security that works best
  • Using crypto correctly is important
  • The more we make other parts of security behave like crypto, the better

Why Study Cryptanalysis?

  • Study of cryptanalysis gives insight into all aspects of crypto
  • Gain insight into attacker’s mindset
    • “black hat” vs “white hat” mentality
  • Cryptanalysis is more fun than cryptography
    • Cryptographers are boring
    • Cryptanalysts are cool
  • But cryptanalysis is hard

Thank you
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