- https://en.wikipedia.org/wiki/Claude_Shannon
- https://en.wikipedia.org/wiki/Cryptography
- https://www.eff.org/pages/cracking-des
- https://crypto.stanford.edu
- https://www.rsa.com/en-us
- https://www.cloudflare.com/learning/cryptography/
- https://en.wikipedia.org/wiki/History_of_cryptography
- https://www.cryptomuseum.com
- https://www.iacr.org
- https://www.openssl.org/docs