Martin Edward Hellman (born October 2, 1945) is an American cryptologist, best known for his invention of public key cryptography in cooperation with Whitfield Diffie and Ralph Merkle.
Hellman is a longtime contributor to the computer privacy debate, has applied risk analysis to a potential failure of nuclear deterrence, and in 2016 wrote a book with his wife, Dorothie Hellman, that links creating love at home to bringing peace to the planet (A New Map for Relationships: Creating True Love at Home and Peace on the Planet).