Comparer des méthodes

	Schéma de signature numérique	Échange de clés Diffie-Hellman
Domaine	Cryptographie	Cryptographie
Famille	Process / pipeline	Process / pipeline
Année d'origine	1978	1976
Auteur d'origine	Ronald Rivest, Adi Shamir, Leonard Adleman	Whitfield Diffie, Martin Hellman
Type	Asymmetric signature algorithm	Asymmetric key exchange algorithm
Source fondatrice	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.
Alias	Digital Signature Algorithm, Message Authentication and Integrity, Public Key Signature	DH Key Exchange, Diffie-Hellman Key Agreement
Apparentées	4	4
Résumé	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.