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Digital Signature Algorithm
The Digital Signature Algorithm (DSA) is a Federal Information Processing Standard for digital signatures. It was proposed by the National Institute of Standards and Technology (NIST) in August 1991 for use in their Digital Signature Standard (DSS) and adopted as FIPS 186 in 1993.〔(【引用サイトリンク】title=FIPS PUB 186]: Digital Signature Standard (DSS), 1994-05-19 )〕 Four revisions to the initial specification have been released: FIPS 186-1 in 1996,〔(【引用サイトリンク】format=PDF )〕 FIPS 186-2 in 2000,〔(【引用サイトリンク】format=PDF )〕 FIPS 186-3 in 2009,〔(【引用サイトリンク】format=PDF )〕 and FIPS 186-4 in 2013.〔(【引用サイトリンク】format=PDF )〕
DSA is covered by , filed July 26, 1991 and attributed to David W. Kravitz,〔(Dr. David W. Kravitz )〕 a former NSA employee. This patent was given to "The United States of America as represented by the Secretary of Commerce, Washington, D.C.", and NIST has made this patent available worldwide royalty-free.〔Werner Koch. (DSA and patents )〕 Claus P. Schnorr claims that his (expired) covered DSA; this claim is disputed.〔(Minutes of the Sept. 94 meeting of the Computer System Security and Privacy Advisory Board )〕 DSA is a variant of the ElGamal Signature Scheme.
==Key generation==
Key generation has two phases. The first phase is a choice of ''algorithm parameters'' which may be shared between different users of the system, while the second phase computes public and private keys for a single user.
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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