Whitfield Diffie

Whitfield Diffie (born 1944) is an American cryptographer who, with Martin Hellman, published the first open account of public-key cryptography in 1976 and invented the key-exchange protocol that made secure communication without prior secrecy practically conceivable. Where others saw a mathematical puzzle, Diffie saw a political problem: the concentration of cryptographic power in government hands threatened individual privacy in an emerging digital society. His instinct was correct — public-key cryptography became the technical foundation not merely of secure commerce but of resistance to surveillance, enabling the architecture of trust that underpins the modern internet and the cypherpunk movement that would later demand cryptographic freedom as a human right.