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Mat 140 Cryptology Day 3 Presentation

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Bits, binary numbers, the XOR cipher, perfect security and one-time pads. For MAT 140: Introduction to the Mathematical Sciences, at Franklin College.

Bits, binary numbers, the XOR cipher, perfect security and one-time pads. For MAT 140: Introduction to the Mathematical Sciences, at Franklin College.

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Transcript

  • 1. Cryptology Day 3: First look at computer ciphers MAT 140: Introduction to the Mathematical Sciences 19 September 2008 Robert Talbert, PhD Associate Professor of Mathematics and Computing Science rtalbert@franklincollege.edu
  • 2. Recap of Day 2 • Integer congruence modulo n • Using integer congruence to make and break shift ciphers • Idea: Representing text characters as numbers and then using math to manipulate them
  • 3. Unicode Worldwide standard for representing characters from the keyboard and various languages in numerical form

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