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Reference.org
ElGamal signature scheme
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<p>The ElGamal signature scheme is a <a href="/facts/Digital_signature/tY7e2pnW">digital signature</a> scheme which is based on the difficulty of computing <a href="/facts/Discrete_logarithm/k8TXh5bL">discrete logarithms</a>. It was described by <a href="/facts/Taher_Elgamal/mx5Ers0r">Taher Elgamal</a> in 1985. </p><p>The ElGamal signature algorithm is rarely used in practice. A variant developed at the <a href="/facts/NSA/Sg6MGV1o">NSA</a> and known as the <a href="/facts/Digital_Signature_Algorithm/0o0FK486">Digital Signature Algorithm</a> is much more widely used. There are several other variants. The ElGamal signature scheme must not be confused with <a href="/facts/ElGamal_encryption/sKDVyMyR">ElGamal encryption</a> which was also invented by Taher Elgamal. </p>