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From Jonathan Barbero <jonathan.barb...@gmail.com>
Subject Detect modifications between signatures
Date Sat, 29 Oct 2016 16:47:49 GMT

 How could I detect any modification between two signatures (visibles or
not) ?

For example:

 An application signs a PDF with PDFbox. A user downloads it, and should
sign it (visible signature). I would like to check that the user didn't add
any modification after the app signature (except it's own user signature).

How could I check it? I guess it's different between a visible signature
and not visible.

Thanks in advance,

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