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Topic: Modify file and fool signature not possible
Conf: (P-PDF) Developers, Msg: 54764
From: orthlieb
Date: 5/29/2002 05:08 PM

This is a multi-part message in MIME format.

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> I need to know for sure if its possible to modify a digitally signed =PDF document in a way that neither acrobat nor acrobat
> compare (which can see differences between two digitally signed =documents) can identify any change or advice that it has
> been modified whatsoever.


It is not possible. The digital signature is over all of the bytes of =the file at the time of signing.

Carl 8^)

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> I need to know for sure if its =possible to
modify a   digitally signed PDF document in a way that neither =acrobat
nor acrobat

> compare (which can see differences =between two
digitally signed documents) can identify any change or advice that it =has

> been modified =whatsoever.


It is not
possible. The digital signature is over all of the bytes of the file at =the time
of signing.

 

Carl 8^)


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