Chevron Left
Back to Number Theory and Cryptography

Learner Reviews & Feedback for Number Theory and Cryptography by University of California San Diego

536 ratings

About the Course

A prominent expert in the number theory Godfrey Hardy described it in the beginning of 20th century as one of the most obviously useless branches of Pure Mathematics”. Just 30 years after his death, an algorithm for encryption of secret messages was developed using achievements of number theory. It was called RSA after the names of its authors, and its implementation is probably the most frequently used computer program in the world nowadays. Without it, nobody would be able to make secure payments over the internet, or even log in securely to e-mail and other personal services. In this course we will start with the basics of the number theory and get to cryptographic protocols based on it. By the end, you will be able to apply the basics of the number theory to encrypt and decrypt messages, and to break the code if one applies RSA carelessly. You will even pass a cryptographic quest! As prerequisites we assume only basic math (e.g., we expect you to know what is a square or how to add fractions), basic programming in python (functions, loops, recursion), common sense and curiosity. Our intended audience are all people that work or plan to work in IT, starting from motivated high school students....

Top reviews


Jul 31, 2020

I loved this course! It is unlike any I have taken before. All courses in this specialization have always included fun activities to make the taught content fun and understandable.


Nov 21, 2018

I was really impressed especially with the RSA portion of the course. It was really well explained, and the programming exercise was cleverly designed and implemented. Well done.

Filter by:

1 - 25 of 115 Reviews for Number Theory and Cryptography

By Konstantin K

Dec 19, 2017

By Doug D

Dec 26, 2018

By Steven W

Dec 12, 2017

By liang t

Jan 2, 2018

By Pedro H

Jun 17, 2018

By Pete W

Nov 22, 2018

By T K

May 28, 2020

By Gholamreza S T

Oct 16, 2018

By Prasad K

Mar 19, 2019

By William H

Apr 3, 2020

By Ashish S

Jul 23, 2018

By Jinqiang Z

Dec 9, 2017

By Tomasz L

Sep 2, 2019


Jul 2, 2018

By Nikita S

Mar 25, 2021

By Amy G

Apr 24, 2020

By Bhargav D

Dec 27, 2018


Mar 15, 2020

By Srinath S

Aug 1, 2020

By Michal B

Mar 28, 2020

By Greg M

Apr 21, 2019

By Ruben G C

Jun 4, 2019

By Yordan S

Jan 1, 2019

By Dmytro F

Jan 30, 2018

By Aditya D

Oct 7, 2018