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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.〔 - this article appeared earlier in the (proceedings to Crypto '84 ).〕 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. The ElGamal signature scheme must not be confused with ElGamal encryption which was also invented by Taher ElGamal. The ElGamal signature scheme allows a third-party to confirm the authenticity of a message sent over an insecure channel. ==System parameters== * Let ''H'' be a collision-resistant hash function. * Let ''p'' be a large prime such that computing discrete logarithms modulo ''p'' is difficult. * Let ''g'' < ''p'' be a randomly chosen generator of the multiplicative group of integers modulo ''p'' . These system parameters may be shared between users. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ElGamal signature scheme」の詳細全文を読む スポンサード リンク
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