Happy Diffie-Hellman Day!
On November 1st, 1976, a paper was released to the world titled "New Directions in Cryptography" by Whitfield Diffie & Martin E. Hellman. Marking the first practical protocol for safely exchanging cryptographic keys over a public channel. Initially conceptualized by Ralph Merkle, and then actualized in the Diffie-Hellman key exchange. 
