Cryptography is the art of creating mathematical assurances for who can do what with data, including but not limited the classical example of encrypting messages so that only the key-holder can read it. Cryptography lives at an intersection of math, programming, and computer science. This subreddit covers the theory and practice of modern and *strong* cryptography, and it is a technical subreddit focused on the algorithms and implementations of cryptography.

Create Post

r/crypto Rules

Crypto review requests must explain the algorithms

Challenges and puzzles must use modern crypto

Don't flood the sub with duplicate posts

Stick to the topic of cryptography

Maintain high quality & accuracy, don't mislead

Don't cheat on challenges or tests!

Link directly to the original (with exceptions)

Related subreddits

259,617 subscribers

296,873 subscribers

12,790 subscribers

15,773 subscribers

89 subscribers

75 subscribers

Guidelines for /r/crypto

This sub is for cryptography, NOT cryptocurrency.

RULES (along with reddiquette)

Assume good faith & be kind. This is a friendly subreddit.
Codes, simple ciphers, ARGs, and other such "weak crypto" don't belong here. If a desktop computer can break a code in less than an hour, it's not strong crypto. See /r/codes. This includes cracking challenges.
Do not ask people to break your cryptosystem without first sharing the algorithm. Sharing just the output is like…
Familiarize yourself with the following before asking about a novel cryptosystem:
- Kerckhoffs's principle
- Schneier's Law
Don't use this sub to cheat on competitions or challenges!
Systems that use crypto are not necessarily relevant here.

Resources