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Cryptology

tags:: #Lecture

Can you keep a secret?:

  • Cryptology: Systems for ‘secret’ writing
  • Cryptanalysis: Systems for revealing those secrets
  • Sometimes we don't need to know what the symbols mean, we can decipher who's talking to whom, for example who's a spy
  • By mapping connections we can build a network of people all from one secret messages origins 
  • It's not just what's in the message that's important, it's also the pattern in which the message reveals
  • Code: variable sized elements that have meaning in the plaintext language, syllables, words, phrases
  • Cipher: a transformation from plaintext according to some transformation
  • Nomenclatures:
    • Mixture of substitution ciphers and code books Susceptible to the frequency analysis