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

4.5
stars
276 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

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.

MT

Jul 22, 2020

This course has deepened my interest in Cryptography. I am a fan of Da Vinci and ciphers. I am gonna dig a lot deeper in this. Thanks for providing the required directivity.

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51 - 53 of 53 Reviews for Symmetric Cryptography

By Ivon S

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May 23, 2019

is very difficult to understand.

By Matt B

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Jan 11, 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

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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.