Digital signature generating method and digital signature verifying method
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United States of America Patent
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Nov 9, 2004
Grant Date -
Aug 8, 2002
app pub date -
Feb 28, 2001
filing date -
Dec 7, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
In a signature generating method where not necessarily all of a plurality of signature generating devices work together each time to generate signatures, the present invention seeks to correctly and securely reflect data relating to previous signatures. When generating signatures, the data used for the next signature is sent beforehand to the other signature generating devices. Also, when generating signatures, at least one of the devices is used consecutively, thus allowing history data to be shared during signature generation.
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