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.
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
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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
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