Wing

Symmetric Cryptography & Hashing

1970s

Merkle Tree

Ralph Merkle, 1979

Binary tree of hashes over data blocks; the root commits to the entire collection.

1990s

RSA-OAEP Padding

Mihir Bellare & Phillip Rogaway, 1994

Optimal Asymmetric Encryption Padding mixes the message with random seed and hash in a reversible block before modular exponentiation.

SHA-256 block compression

NSA / NIST (FIPS 180 family), 1995

Tour of a 512-bit chunk as words, round constants, message-schedule growth, and digest-shaped state pulses—no real hash output.

2000s

AES Round Function (one round)

Joan Daemen & Vincent Rijmen / NIST, 2001

Schematic tour of SubBytes, ShiftRows, MixColumns, and AddRoundKey on a 4×4 state—illustrative glyphs, not real cryptography.