Comparar métodos

	Esquema de Assinatura Digital	Função Hash SHA
Área	Criptografia	Criptografia
Família	Process / pipeline	Process / pipeline
Ano de origem	1978	1993
Autor original	Ronald Rivest, Adi Shamir, Leonard Adleman	National Institute of Standards and Technology (NIST)
Tipo	Asymmetric signature algorithm	One-way hash algorithm
Fonte seminal	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.	National Institute of Standards and Technology (1993). Secure Hash Standard (SHS). Federal Information Processing Standards (FIPS) Publication 180.
Outros nomes	Digital Signature Algorithm, Message Authentication and Integrity, Public Key Signature	SHA-1, SHA-256, SHA-512, Secure Hash Algorithm
Relacionados	4	4
Resumo	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 Secure Hash Algorithm (SHA) is a family of cryptographic hash functions standardized by NIST starting in 1993. SHA functions produce fixed-length digests from arbitrary-length input data, serving as a fundamental building block for digital signatures, message authentication, and data integrity verification across security-critical applications.