手法を比較

	ディフィー・ヘルマン鍵交換	デジタル署名方式
分野	暗号学	暗号学
系統	Process / pipeline	Process / pipeline
提唱年	1976	1978
提唱者	Whitfield Diffie, Martin Hellman	Ronald Rivest, Adi Shamir, Leonard Adleman
種類	Asymmetric key exchange algorithm	Asymmetric signature algorithm
原典	Diffie, W., & Hellman, M. E. (1976). New directions in cryptography. IEEE Transactions on Information Theory, 22(6), 644–654.	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.
別名	DH Key Exchange, Diffie-Hellman Key Agreement	Digital Signature Algorithm, Message Authentication and Integrity, Public Key Signature
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.	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.