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

214 ratings
39 reviews

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

Jul 21, 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.

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.\n\nRecommended :)

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26 - 41 of 41 Reviews for Symmetric Cryptography

By Benedict J W

May 27, 2019


By Mr.Arif M A

May 18, 2020



Oct 5, 2021


By jong f

Nov 17, 2020



Sep 3, 2020


By Dasari V R

Jun 3, 2020


By gajveer s r

Nov 21, 2019



Apr 23, 2020

Too delayed to earn this certificate because of not reviewed in the peer-graded assignment.I extended the due dates twice in April 13,2020 and April 20,2020 and now finally I got my certificate.This is the only negative thing that I felt.Please make sure that others peers wont get this complication.

By Shrey B

Nov 30, 2020

This course helps in clearing all the topics in which i have doubt. I have learned new concepts from this.

By Nikhil Y

Jun 4, 2020

it was an amazing experience!!

By Gosai G

Sep 19, 2020


By Rohan L

May 22, 2020

Good for fundamental understanding, but lacks mathematical foundations. So, if u get the math behind what's happening, u will enjoy the course and the quizzes. If not, for a more mathematical approach, refer NPTEL's IIT KGP Course

By M M S

Mar 31, 2018

Reviewing assignment is no one is there

By H.M.Raihan E

May 27, 2020

Okay enough for basics!

By Ivon S

May 23, 2019

is very difficult to understand.

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.