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ElGamal encryption : ウィキペディア英語版
ElGamal encryption

In cryptography, the ElGamal encryption system is an asymmetric key encryption algorithm for public-key cryptography which is based on the Diffie–Hellman key exchange. It was described by Taher Elgamal in 1985.〔 (conference version appeared in CRYPTO'84, pp. 10–18)〕 ElGamal encryption is used in the free GNU Privacy Guard software, recent versions of PGP, and other cryptosystems. The Digital Signature Algorithm is a variant of the ElGamal signature scheme, which should not be confused with ElGamal encryption.
ElGamal encryption can be defined over any cyclic group G. Its security depends upon the difficulty of a certain problem in G related to computing discrete logarithms (see below).
== The algorithm ==
ElGamal encryption consists of three components: the key generator, the encryption algorithm, and the decryption algorithm.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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