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Retour à Number Theory and Cryptography

Avis et commentaires pour d'étudiants pour Number Theory and Cryptography par Université de Californie à San Diego

520 évaluations
113 avis

À propos du cours

Numbers has always been regarded 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 word 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 short online HSE course, we will make the whole journey from the foundation to RSA in 4 weeks. 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. Do you have technical problems? Write to us:

Meilleurs avis

31 juil. 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.

21 nov. 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.

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76 - 100 sur 112 Avis pour Number Theory and Cryptography

par Satyam K M

1 juin 2020


par Luis M V F

11 janv. 2020

In general, this course is much better than the previous 3, and I enjoyed all weeks but Week 4. I think Michael Levin should improve his explanations, and also try to give further examples about the algorithms he is talking about. I would say that it is worthy taking this course, but I really hope Week 4 can be improved.

par Greg L

11 déc. 2017

Generally pretty good. Pretty easy level, and the maths is undemanding. Some imprecision in the wording of the tests, and a little too easy on the programming side, but well worthwhile if you still have some holes in your understanding of the principles of RSA encryption.

par Stephen L

11 mai 2018

The class was interesting but I felt it was difficult and not explained do the modules I had to constantly go back and re-read the slides, re-watch the lectures. There weren't any examples, I feel it would have been helpful in order to grasp the material.

par Mr 4

7 mai 2020

The instructor tried their best to explain difficult topics like cryptography to make as easy as possible. For this, they really deserve great appreciation. It can be improved if they did not just read out the slides but explain them in some places.

par Amir A

12 déc. 2021

It was a great course, however it got really tricky at the end and I couldn't catch some mathematical concepts very well since English is my second language. I hoped there was more numerical examples before proofs.

par Aren T

19 nov. 2019

Final week is a bit rushed, think it would have benefited from being one week longer.

Nevertheless, an excellent introduction to an extremely difficult and complex subject.

par Camilo G

11 févr. 2021

Some of the material is a bit hard to follow at times, but it's quite interesting and the final Quest quiz is a nice and fun way of putting everything together.

par Stephen S

18 avr. 2020

Great introduction to number theory, with little to no assumed knowledge. Proceeds quite quickly, but remains relatively simple and introduces concepts well.

par Gautham A N

9 déc. 2018

Amazing course, learnt a lot. The assignments were a bit difficult [ and time consuming ] but they helped me gain a better understanding of the concepts.

par Ivan L F

8 avr. 2018

Good material and presentation from the professors. Programming exercises were a bit confusing at times. Overall, short but mathematically solid course.


6 juil. 2020

It was a great course which helped me learn number theory and introduced me to Cryptography.

The teaching assistants could have been more active.

par Mariam M

8 nov. 2020

It was good, one needs an advanced level of python coding to get through howecer the final assignment I enjoyed quite a lot.

par Alex Y

17 janv. 2019

Sometimes material is very dense. Watching in 1x speed multiple times advisable for some modules later in the course.


4 août 2020

The last week of the course makes everything else in the course so worth it! Had a great time doing this course!

par cauclicmorphism

6 mars 2021

Extensive coding skills and a thorough understanding of the key concepts are needed to pass this course.

par Rick B

14 août 2020

Slide and instruction could use more concrete examples, but final project was excellent.

par Tomáš N

29 avr. 2020

It was really slow in the beginning, but I loved the RSA Quest!

par Ajit B

21 nov. 2017

Great course, just felt that the last quiz was a bit redundant.

par Abhinav B

16 mai 2020

Some of the questions related to week6 did not behave properly

par Nikhil Y

12 mai 2020

a really starter for cryptography!!

par Ihsan M R

31 juil. 2021

Great Course

par Ethan H

31 janv. 2021

In all honesty, this was my least favorite course in this specialization so far. Alex and Michael did a great job with making interactive lectures in Graph Theory, but for some reason, the Number Theory lectures were much more textbook-like recitations. There were certainly times in the lecture when I felt like I would want to see them on the whiteboard. There were also times when critical steps of a proof were not really emphasized (or on the slides at times) and it was very confusing. I spent a lot of this course supplementing with MIT OCW lectures. All this being said, the final RSA quest assignment was awesome; it's clear that the profs had a really fun time putting it together and it showed. Thanks!

par Baruch L

4 déc. 2020

The lectures are not always clear enough. Somtimes the explanations in the speech of the formulas are not accurate enough and it will be better to add more formal explanations with letters.

i don't understand why during the course the staff did not answered to some of my questions from the theoretical material although I paid twice for the course.

I left 6 unanswered questions in the fourth week in the forum. I hope that the staff will answered them.

My email is

par Lionel L R Q

10 juil. 2020

The concepts taught are honestly pretty interesting and i enjoyed learning the content. However, there were some parts of the lesson that you wish an example would be given for clarity, e.g. explanation on RSA. Also, don't expect much help from the discussion forums by teaching staff as reply rate is slow. Lastly, debugging for the RSA codes are pretty limited, so do expect more time spent! Overall, still an insightful course for an introduction on Cryptography.