Information processing system, information processing...

Details Information processing system, information processing... Information processing system, information processing...

2011-04-26

2011-04-26

Moazzami, Nasser (Department: 2436)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S168000

Reexamination Certificate

active

07934100

ABSTRACT:
An information processing system includes a unit that selects a time stamp authority to which a request for generation of a time stamp, the time stamp authority to be selected is different from a time stamp authority selected in a last selection process which has been performed; a unit that acquires the time stamp from the selected time stamp authority; a unit that generates link information specifying an order in which time stamps; a controller that causes verification information including the time stamp, identification information of the time stamp authority, the link information, that are associated with each other; a unit that receives a time stamp verification request with regard to digital data; and a unit that compares an invalidated time stamp applied to digital data to be verified with a time stamp to thereby specify a time range in which the invalidated time stamp is applied.

REFERENCES:
patent: 2002/0091928 (2002-07-01), Bouchard et al.
patent: 2005/0160272 (2005-07-01), Teppler
patent: 2005284901 (2005-10-01), None
patent: 2005286443 (2005-10-01), None

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