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# Mat 140 Cryptology Day 2 Presentation

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Day 2 of minicourse on cryptology for MAT 140: Introduction to the Mathematical Sciences at Franklin College. Subjects: integer congruence, modular arithmetic, using modular arithmetic with spreadsheets to do shift ciphers.

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### Transcript of "Mat 140 Cryptology Day 2 Presentation"

1. 1. Cryptology Day 2: Codemaking as mathematics MAT 140: Introduction to the Mathematical Sciences 17 September 2008 Robert Talbert, PhD Associate Professor of Mathematics and Computing Science rtalbert@franklincollege.edu 1
2. 2. Recap of Day 1 • Cryptology • Shift cipher; plaintext; ciphertext; the encryption process • Key; keyspace; brute force attack and exhaustive keyspace search • Monoalphabetic substitution; statistical attacks 2
3. 3. Shift cipher keys 0 = 26 = 52 = 78 = -26 = ... 1 = 27 = 53 = 79 = -25 = ... 2 = 28 = 54 = 80 = -24 = ... ... 24 = 50 = 76 = 102 = -2 = ... 25 = 51 = 77 = 103 = -1 = ... 3
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