Cryptography challenges from the cryptopals website.
Challenges are organized as integration tests, with one module for each challenge set.
To verify solutions:
git clone https://github.com/unseddd/cryptopals
cd cryptopals
cargo test --all
Reading the source code in this repository, and/or running the tests will spoil the challenges for you.
Don't do it unless you've already solved the challenges, or just don't care about spoiling them for yourself.