Systems and methods for obtaining digital signatures on a...

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Central trusted authority provides computer authentication

Reexamination Certificate

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C713S181000

Reexamination Certificate

active

07139910

ABSTRACT:
The invention includes systems and methods for maintaining control of an electronic record, which may have transferable value, wherein a user may add digital signature information to a single unique authoritative copy of the electronic record held in a repository without compromising the uniqueness of the authoritative electronic record. Provided the digital signature information is valid, an authoritative electronic record may be amended to include multiple digital signatures, while continuing to be a single unique authoritative electronic record.

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patent: 5615268 (1997-03-01), Bisbee et al.
patent: 5633931 (1997-05-01), Wright
patent: 5659616 (1997-08-01), Sudia
patent: 5673316 (1997-09-01), Auerbach et al.
patent: 5748738 (1998-05-01), Bisbee et al.
patent: 6212281 (2001-04-01), Vanstone
patent: 6237096 (2001-05-01), Bisbee et al.

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