Martin Hellman is an American cryptographer known for co-inventing public-key cryptography with Whitfield Diffie and Ralph Merkle in the 1970s. Martin received the 2015 Turing Award together with Whitfield Diffie “for inventing and promulgating both asymmetric public-key cryptography, including its application to digital signatures, and a practical cryptographic key-exchange method. “ In this episode he joins Gregor Vand to talk about his life and career.