View source for Ralph Merkle

'''Ralph C. Merkle''' (born 1952) is an American computer scientist who invented public-key cryptography as an undergraduate at Berkeley in 1974 — two years before [[Whitfield Diffie]] and [[Martin Hellman]] published their independent discovery. Merkle's scheme, known as [[Merkle's puzzles]], used a computationally asymmetric puzzle-and-solution protocol to establish shared secrets over public channels. The asymmetry was primitive — the legitimate parties performed linear work while an eavesdropper faced quadratic cost — but the conceptual breakthrough was decisive: for the first time, cryptography could function without prior shared secrecy. Merkle later co-invented the [[Merkle tree]], a hash-based data structure that became fundamental to blockchain architectures and tamper-evident logging systems, proving that his instincts for minimal-trust design would shape decades of secure infrastructure.

[[Category:Cryptography]] [[Category:Computer Science]]