System, method, and program for ensuring originality

Details System, method, and program for ensuring originality System, method, and program for ensuring originality

2006-08-29

2006-08-29

Louis-Jacques, Jacques H. (Department: 2134)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Central trusted authority provides computer authentication

C713S175000, C713S176000

Reexamination Certificate

active

07100045

ABSTRACT:
Each of the embodiments of the present invention supplies date information issued from a third party to a digital signature of a first user apparatus for an electronic document. Originality of the electronic document is ensured by applying the digital signature of the third party to a set of the digital signature and date information. No electronic document is transmitted to the third party apparatus during originality assurance of the electronic document. Accordingly, it is possible to decrease loads to the third party and associated networks even if the third party apparatus is congested with accesses. Since there is registered an undeniable signature for a second user apparatus, it is possible to prevent the second user apparatus from denying the reception.

REFERENCES:
patent: 5638446 (1997-06-01), Rubin
patent: 5724425 (1998-03-01), Chang et al.
patent: 6021491 (2000-02-01), Renaud
patent: 6363365 (2002-03-01), Kou
patent: 6510513 (2003-01-01), Danieli
patent: 2001/0037313 (2001-11-01), Lofgren et al.
patent: 08-185376 (1996-07-01), None

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