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Learner Reviews & Feedback for Symmetric Cryptography by University of Colorado System

4.5
stars
275 ratings

About the Course

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....

Top reviews

DL

Aug 3, 2020

course design is brilliant. assignment questions are wonderful. peer review , flash quiz amazing.

SC

Jun 1, 2021

Good view of the basic Symmetric Crypto concepts. Theory is presented in an easy way to understand way. Professor is also super clear in his explanations. Recommended :)

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51 - 53 of 53 Reviews for Symmetric Cryptography

By Ivon S

•

May 23, 2019

is very difficult to understand.

By Matt B

•

Jan 10, 2025

This course is objectively terrible. There is no support. The pseudo-code assignments are complete black boxes graded by AI. The Feistel / DES lectures are incomprehensible. There are errors in the quiz answers. The quizzes ask questions which the lectures do not prepare you to answer. I would strongly advise all people to think about a different course. I wish I hadn't enrolled in either this course or this specialization. What a waste of time.

By Parth S

•

Oct 27, 2019

The instructor is not teaching the stuff that comes in the quizzes which makes the quizzes very difficult to pass and he is not able to develop interest in the subject.