Digital Signature Algorithm (DSA)
Oct 22, 2023
The Digital Signature Algorithm (DSA) is defined by the National Institute of Standards and Technology as a Federal Information Processing Standard for digital signatures, based on the mathematical concept of modular exponentiations and the discrete logarithm problem.
The Digital Signature Algorithm consists of a public-key cryptosystem that is based on modular exponentiation and the discrete logarithm problem.
DSA is a variant of the Schnorr and ElGamal signature schemes. The National Institute of Standards and Technology (NIST) proposed DSA for use in their Digital Signature Standard (DSS) in 1991, and adopted it as FIPS 186 in 1994. Four revisions to the initial specification have been released. The newest specification is: FIPS 186-4 from July 2013.
DSA Algorithm has three main advantages:
- It allows you to verify the origin of the sender using the right key combination.
- It doesn’t allow you to tamper with the message
- It doesn’t allow the sender to claim they never sent the message the signature is verified
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