Whitfield Diffie and Martin E. Hellman release their proposal for a breakthrough in cryptographic communication: the first implementation of public/private key pairs for secure communication over public channels.

Diffie-Hellman Day is a commemoration of their groundbreaking work in 1976, who introduced the concept of public-key cryptography and the Diffie-Hellman key exchange algorithm. This innovation revolutionized secure data transmission over public channels, enabling two parties to establish a shared secret key without actually exchanging the key itself.