Welcome to Symmetric Cryptography! Symmetric cryptography relies on shared secret key to ensure message confidentiality, so that the unauthorized attackers cannot retrieve the message. The course describes substitution and transposition techniques, which were the bases for classical cryptography when the message is encoded in natural language such as English. Then, we build on product ciphers (using both substitution and transposition/permutation) to describe modern block ciphers and review the widely used cipher algorithms in DES, 3-DES, and AES. Lastly, we enable the use of block ciphers to support variable data length by introducing different modes of block cipher operations in ECB, CBC, CFB, OFB, and CTR modes. This course is cross-listed and is a part of the two specializations, the Applied Cryptography specialization and the Introduction to Applied Cryptography specialization.
Module Ojectives
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Skills You'll Learn
Algorithms, Critical Thinking, Theoretical Computer Science, Security Engineering, Mathematics, Mathematical Theory & Analysis
Reviews
4.5 (266 ratings)
- 5 stars70.30%
- 4 stars19.92%
- 3 stars4.51%
- 2 stars2.63%
- 1 star2.63%
LM
Sep 17, 2024
Great course. I'd say that the AES modes XTS and GCM should be covered too. Regardless, the course and professor is great and explains on great detail.
AJ
May 23, 2020
A great learning experience. I teach Cryptography in my Institution and this course helped me gain additional insights on the course.
From the lesson
3-DES and AES
To provide stronger security than DES, modern symmetric ciphers can either use multiple ciphers or use an entirely different algorithm. This module reviews examples of each in Triple-DES and AES.
Taught By
Sang-Yoon Chang
Assistant Professor