CS/ECE/Math 435, Introduction to Cryptography  Spring 2014
Nigel Boston
Contact Information
3619 Engineering Hall, 303 Van Vleck
Telephone: 2653817, 2634753.
Email: boston@math.wisc.edu
Homepage
Office Hours: T 2:304:00 in 303VV and W 1:303:00 in 3619 EH; or by appointment.
Text
Eric Bach's course notes can be picked up at Bob's Copy Shop.
Interesting Links
Famous Unsolved Codes and Ciphers
Comic courtesy of Bill Kay
Diaconis article
Stick figure guide to AES, courtesy of John Cabaj
Vigenere cipher used by Confederacy
Magician card trick of Fitch Cheney
Course objectives
Familiarity with the major algorithms of historical and
modern cryptography as documented in open literature;
knowledge of issues involved in choice of algorithm and
key size; ability to analyze performance of various cryptographic and cryptanalytic algorithms
Topics covered

Classical cryptography: substitution ciphers, polyalphabetic
methods, etc.

Introduction to cryptanalysis: frequency counts, coincidence
index, Shannon's theory

Block ciphers (DES, IDEA, AES, etc.)

Publickey cryptography (modular arithmetic, systems based
on factoring and discrete logarithms)

Cryptographic protocols (key exchange methods, digital
signatures, secret sharing, authentication)
Sections
 Main Lecture: TuTh, 1:002:15, B371 Chemistry.
Grading Policy
Homeworks will count for 20% of the final grade, the midterms for 20% each, and the final exam for 40%.
If you score 90% or higher, you will get an A; if you score 80% or higher, you will at least get a B;
if you score 70% or higher, you will at least get a C; if you score 60% or higher, you will at least
get a D.
Homework Assignments
Homework will be set most Thursdays and due the following Thursday. You are encouraged to discuss
the exercises with your classmates but the work you hand in should be your own.
 1st Homework, due Thursday, Feb 6
 2nd Homework, due Thursday, Feb 13
 3rd Homework, due Thursday, Feb 20
 4th Homework, due Thursday, Feb 27
 5th Homework, due Thursday, Mar 13
 6th Homework, due Thursday, Apr 3
 7th Homework, due Thursday, Apr 10
 8th Homework, due Thursday, Apr 24
 9th Homework, due Thursday, May 1
 10th Homework, due Thursday, May 8
The following tables may be of help to you:
 Addition and Multiplication mod 26
 Helpful Statistical Information for Cryptograms
Midterms
Final