เปรียบเทียบวิธี

	ลายเซ็นดิจิทัล	ฟังก์ชันแฮช SHA
สาขาวิชา	วิทยาการเข้ารหัสลับ	วิทยาการเข้ารหัสลับ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1978	1993
ผู้ริเริ่ม	Ronald Rivest, Adi Shamir, Leonard Adleman	National Institute of Standards and Technology (NIST)
ประเภท	Asymmetric signature algorithm	One-way hash algorithm
แหล่งต้นตำรับ	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.
ชื่อเรียกอื่น	Digital Signature Algorithm, Message Authentication and Integrity, Public Key Signature	SHA-1, SHA-256, SHA-512, Secure Hash Algorithm
ที่เกี่ยวข้อง	4	4
สรุป	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.