1) Julius Caesar - Simple Cipher
Key pair encryption - Merkle
2) Adam Back - POW hash cash
3) Nick Szabo - Timestamp chaining
And...
4) Yoshi Itsuki from nostr:nprofile1qqsxugjjylrmak4hvhn5k2ddnqgvsereprgq9sdeunp3jhxa58dgafcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhskum55f for his work with Zen Kamera (a cover for the international encryption work he did in the 80s and 90s)