Apparatus to create and/or verify digital signatures having a secure time element and an identifier of the apparatus
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United States of America Patent
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Feb 14, 2006
Grant Date -
N/A
app pub date -
Apr 14, 2000
filing date -
May 31, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a signature creating apparatus, a clock generates a time stamp and in which time can be set only by a computer installed in a certificate authority center. Further, connecting sections connects an apparatus ID for specifying an apparatus and the time stamp and personal identification information for identifying an implementor to a plain-text so as to create data for the signature. A signature creating circuit encrypts the data for the signature using a signature creating key or the like and generates the signature. A connecting section connects the signature to the data for the signature and transmits the data as data after signature.
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