Mat 140 Cryptology Day 2 Presentation

1,020 views

Published on

Using integer congruence and modular arithmetic to do shift ciphers on a spreadsheet. Day 2 of minicourse for MAT 140: Introduction to the Mathematical Sciences.

Published in: Education, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,020
On SlideShare
0
From Embeds
0
Number of Embeds
7
Actions
Shares
0
Downloads
22
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

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

×