Multi-step digital signature method and system
申请(专利)号：
08/869253
申请日期：
06/04/1997
公开/公告号：
US5825880
公开/公告日期：
10/20/1998
申请(专利权)人：
SUDIA; FRANK W. FREUND; PETER C. HUANG; STUART T.F.
被引量：
摘要：
A multi-step signing system and method uses multiple signing devices to affix a single signature which can be verified using a single public verification key. Each signing device possesses a share of the signature key and affixes a partial signature in response to authorization from a plurality of authorizing agents. In a serial embodiment, after a first partial signature has been affixed, a second signing device exponentiates the first partial signature. In a parallel embodiment, each signing device affixes a partial signature, and the plurality of partial signatures are multiplied together to form the final signature. Security of the system is enhanced by distributing capability to affix signatures among a plurality of signing devices and by distributing authority to affix a partial signature among a plurality of authorizing agents.
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