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· DSA - Digital Signature Algorithm
Es de recalcar que aunque el algoritmo citado puede emplearse también para cifrar información, su complejidad y el hecho de duplicar el texto cifrado la longitud del texto en claro lo hacen poco recomendable para tal fin. [Ribagorda:1997]
Algoritmo criptográfico de clave pública que puede emplearse tanto para cifrar como para obtener firmas digitales y que basa su seguridad en la dificultad de calcular logaritmos discretos en un campo finito. [CESID:1997]
(N) An algorithm for asymmetric cryptography, invented in 1985 by Taher El Gamal, that is based on the difficulty of calculating discrete logarithms and can be used for both encryption and digital signatures. [ElGa] [RFC4949:2007]
The ElGamal
signature scheme is a digital signature scheme which is based on the difficulty
of computing discrete logarithms. It was described by Taher ElGamal in 1984
(see T. ElGamal, A public key cryptosystem and a signature scheme based on
discrete logarithms, IEEE Trans inf Theo, 31:469-472, 1985).
The ElGamal
signature algorithm described in this article is rarely used in practice. A
variant developed at NSA and known as the Digital Signature Algorithm is much
more widely used. There are several other variants (see K. Nyberg and R. A.
Rueppel, Message recovery for signature schemes based on the discrete logarithm
problem, J Crypt, 8:27-37, 1995). The ElGamal signature scheme must not be
confused with ElGamal encryption which was also invented by Taher ElGamal.
The ElGamal
signature scheme allows that a verifier can confirm the authenticity of a
message m sent by the signer sent to him over an insecure channel.
http://en.wikipedia.org/wiki/ElGamal_signature_scheme
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