An Introduction to Cryptography

**Scott Sutherland ^{1}
**

**October 14, 2005 (revised 26 October 2005)**

We introduce ideas and techniques from cryptography,
using mathematics related to the middle-school mathematics
curriculum. The majority of the material in this note was presented
as part of a professional development workshop for middle-school
mathematics teachers.

- ... Sutherland
^{1} -
Institute for Mathematical Sciences, Stony Brook University,
Stony Brook, New York, 11794-3660.
`scott@math.sunysb.edu`,`http://www.math.sunysb.edu/scott/`

- 1 Pleased to Meet You, Hope You Guessed My Name
- 2 I'm a Substitute for Another Guy
- 3 The Caesar Cipher and Modular Arithmetic
- 4 Many Caesars: the Vigenère Cipher
- 5 An Unbreakable Cipher
- 6
*Mod*ern Times - 7 Twins and Triplets
- 8 The Hill Cipher
- 9 Adieu
- Bibliography
- About this document ...

Scott Sutherland

2005-10-26

2005-10-26