Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...

plaintext AND to decrypt a ciphertext. That is four operations, and most resources show one. Every sheet here does all four. 8-bit ASCII code is given, and so is the one-time pad’s; the student poses ...

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