Document modification detection and prevention

Details Document modification detection and prevention Document modification detection and prevention

2003-05-16

2010-06-08

Orgad, Edan (Department: 2439)

Information security

Prevention of unauthorized use of data including prevention...

Access control

C713S176000, C726S002000, C726S021000, C726S026000, C705S050000, C705S051000, C705S055000

Reexamination Certificate

active

07735144

ABSTRACT:
Methods and apparatus, including computer program products, implementing and using techniques for document authentication. An electronic document is presented to a user. The electronic document has data representing a signed state and a current state. A disallowed difference between the signed state and the current state is detected, based on one or more rules that are associated with the electronic document. A digital signature associated with the electronic document is invalidated in response to the detecting.

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