# Introduction to Cryptography - CMSC 456

# Spring 2016

## Course Outline

This course is an undergraduate introduction to cryptography, whose
aim is to present the theoretical foundations of
cryptosystems used in the real world.
This course complements Computer and Network Security (CMSC 414), which focuses more on "high-level" issues and actual systems; in this class, we will look "under the hood" to get a better understanding of various cryptographic primitives, algorithms, attacks, and protocols.

The required textbook for the course is *Introduction to Modern Cryptography, 2nd edition*, by myself and Yehuda Lindell. The course will follow the book closely.

**Note:** The second edition has a number of topics not included in the first edition, plus additional exercises. *The second edition of the book is required.* The exams will be "open book" but electronics will not be allowed; therefore, students are advised not to use a Kindle edition or
(illegal) copies of the book that can be found online.

*This course has a significant mathematical component*.
No advanced mathematics background is assumed, but students are expected to have "mathematical maturity" since many of the concepts will be abstract, rigorous definitions and proofs will be given, and some advanced mathematics (group theory, number theory) will be covered.
Basic background in discrete mathematics (probability, modular arithmetic) and algorithms (big-O notation, reading pseudocode) is assumed.

Moreover, *some of the homeworks will require programming*. The choice of language is flexible, however some homeworks will have a networking component with the networking code provided for you in a particular language. It is assumed you can pick up what is needed in order to complete the assignments.

The course will be similar, though not identical, to my previous offering of this course.
## Lecture Schedule

After each lecture, I will post a (brief) summary of what we cover, and provide references to relevant sections of the book, here.
## Announcements

- Homework 7 is out.
- My course on Coursera provides a useful resource for learning about much of the material presented in class.
- I have registered the course on Piazza. Please ask questions about the lectures/homeworks there, and check frequently for announcements.

## General Information

- The class meets Monday, Wednesday, and Friday from 10:00 - 10:50 in 2117 CSIC.
**Grading** will be based on homeworks assigned throughout the course (30%), a midterm exam (35%), and a final exam (35%). *Note than exams constitute a majority of the grade!*
**Homework**
- You may collaborate on the homeworks with at most one other student in the class. Each student must independently write up their own solutions/code, and must list the other student (if any) with whom they collaborated.
- You may consult outside references when doing the homework, as long as these sources are properly referenced, you write up the solution yourself, and
*you understand the answer*.

- Check the course homepage frequently for announcements
and to follow the updated syllabus.

## Staff

**Instructor:** Jonathan Katz (`jkatz AT cs`). Office: 3415 A.V. Williams Building. Office hours: by appointment.
(If you want to meet, send me an email.)

**Teaching Assistant:** Huijing Gong (`gong@cs.umd.edu`). Office hours: Monday and Wednesday 4-5 in 4103 AV Williams.