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	デジタル署名方式	ディフィー・ヘルマン鍵交換
分野	暗号学	暗号学
系統	Process / pipeline	Process / pipeline
提唱年	1978	1976
提唱者	Ronald Rivest, Adi Shamir, Leonard Adleman	Whitfield Diffie, Martin Hellman
種類	Asymmetric signature algorithm	Asymmetric key exchange algorithm
原典	Rivest, R. L., Shamir, A., & Adleman, L. (1978). A method for obtaining digital signatures and public-key cryptosystems. Communications of the ACM, 21(2), 120–126.	Diffie, W., & Hellman, M. E. (1976). New directions in cryptography. IEEE Transactions on Information Theory, 22(6), 644–654.
別名	Digital Signature Algorithm, Message Authentication and Integrity, Public Key Signature	DH Key Exchange, Diffie-Hellman Key Agreement
関連	4	4
概要	A digital signature scheme provides authentication, integrity assurance, and non-repudiation of electronically signed documents. Using public-key cryptography (such as RSA, DSA, or ECDSA), the originator signs a message with a private key in a way that any recipient can verify the signature using the originator's public key, proving that the message was created by the claimed author and has not been tampered with.	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.