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Permutations (January 13) [.pdf]
Crypto-Chronology slides [Part I .pdf] (not all were used in class on January 13)
Crypto-Chronology slides [Part II .pdf] (not all were used in class on January 13)
Warm-up Exercises for January 20 [.pdf]
Affine Ciphers, Decimation Ciphers, and Modular Arithmetic (January 22) [.pdf]
Monoalphabetic Substitutions (January 27) [.pdf]
Crytanalysis of Monoalphabetic Substitutions (January 27) [.pdf]
Transposition Ciphers (January 27) [.pdf]
Warm-up Exercises for February 3 [.pdf]
Cryptanalysis of the Hill Cipher (February 5) [.pdf]
Binary One-Time Pad (February 12) [.pdf]
ASCII Codes (February 12) [.pdf]
Feedback Shift Registers (February 12) [.pdf]
RSA-129 (March 12) [.pdf]
Bézout's Identity (March 26) [.pdf]
Basic Internet Security (March 31) [.pdf]
The Theoretically Possible Number of Enigma Configurations (April 2) [.pdf]
Paper Enigma Machine (April 2) [.pdf]