Method and apparatus for self-authenticating digital records

Details Method and apparatus for self-authenticating digital records Method and apparatus for self-authenticating digital records

2006-05-16

2006-05-16

Smithers, Matthew (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Central trusted authority provides computer authentication

C713S157000, C713S158000, C713S159000, C705S044000, C709S226000, C380S030000

Reexamination Certificate

active

07047404

ABSTRACT:
A method for proving the validity of a record digitally signed by a user having a digital certificate issued by a certification authority within a hierarchy of certification authorities. The user signs the record, and obtains the digital certificates and certificate revocation information for all the certification authorities in the chain of the hierarchy extending from the user to the root certification authority. A timestamp is applied to the record, the digital certificates and the certificate revocation information to establish a point in time in which all items were created, current and valid. If, at some later point, one or more of the digital certificates either expire or are revoked, the timestamp serves as evidence of the integrity of the signed record.

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patent: 6301658 (2001-10-01), Koehler
Hans Nilsson, iD2 Technologies, Hans.Nilsson@iD2tech.com; “Validation of Electronic Signatures White Paper” pp. 1-10; Mar. 19, 1999; http://www.id2tech.com
ews/pdf/ES—validation.pdf.
International Search Report dated Jan. 2, 2002 in PCT/US01/15779 filed May 16, 2001.

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