Post #3503495

Here's a fairly comprehensive list of "classical" pencil and paper hand ciphers if you want to practice or get familiar with any of them: 1. Massive list at ACA: https://www.cryptogram.org/resource-area/cipher-types/ 2. Hill cipher: https://en.wikipedia.org/wiki/Hill_cipher 3. Solitaire cipher: https://en.wikipedia.org/wiki/Solitaire_(cipher) 4. Chaocipher: https://en.wikipedia.org/wiki/Chaocipher 5. ElsieFour: https://eprint.iacr.org/2017/339 Not that any should be used in place of modern cryptography, but useful for understanding confusion, difussion, and analysis. #cryptography