System, apparatus, program and method for obtaining time stamp

Details System, apparatus, program and method for obtaining time stamp System, apparatus, program and method for obtaining time stamp

2011-02-15

2011-02-15

Pearson, David J (Department: 2437)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

Reexamination Certificate

active

07890764

ABSTRACT:
A time stamp obtaining apparatus for maintaining the certificate of the existence of electronic filing document including: a receiving unit12receiving hash value of the document data; a transmitting section15ctransmitting the hash value to time stamp providing apparatus30a; a storing processing section15dinserting the time stamp encoded with private key in unupdated data16bconcerning time stamp received since point to which private key is updated and storing; an update detecting section11detecting the update of private key; a calculation section13bcalculating hash value for all time stamps included in the unupdated data16b; a transmitting section13ctransmitting the hash value; a storing processing section13dmoving the unupdated data16bto past data16cconcerning time stamp received before point to which private key is updated last time when time stamp is received, storing it, and storing the time stamp newly received as new unupdated data16b; is provided.

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patent: WO 99/16209 (1999-04-01), None
“Guideline of Time Stamp for Long-Run Guarantee”, Time Business Forum (TBF), (2005).

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