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	ディフィー・ヘルマン鍵交換	TLSプロトコル解析
分野	暗号学	暗号学
系統	Process / pipeline	Process / pipeline
提唱年	1976	1994
提唱者	Whitfield Diffie, Martin Hellman	Netscape Communications Corporation, IETF
種類	Asymmetric key exchange algorithm	Cryptographic transport protocol
原典	Diffie, W., & Hellman, M. E. (1976). New directions in cryptography. IEEE Transactions on Information Theory, 22(6), 644–654.	Rescorla, E. (2018). The Transport Layer Security (TLS) Protocol Version 1.3. RFC 8446.
別名	DH Key Exchange, Diffie-Hellman Key Agreement	TLS/SSL Protocol, HTTPS Security, Secure Transport Layer
関連	4	4
概要	The Diffie-Hellman key exchange, invented by Whitfield Diffie and Martin Hellman in 1976, is a foundational protocol for establishing a shared secret over an insecure communication channel. Two parties who have never previously communicated can use Diffie-Hellman to agree on a symmetric encryption key that an eavesdropper cannot easily derive, even after observing all public exchanges.	The Transport Layer Security (TLS) protocol is the cryptographic standard that secures web communication and email transmission. Evolved from SSL (Secure Sockets Layer), TLS provides authentication, encryption, and integrity protection for data in transit. The protocol combines public-key cryptography (RSA, ECDH) for key agreement, symmetric encryption (AES) for bulk data, and digital signatures (SHA-256) for authentication.