Welcome to the PAdES FAQ web site. This site includes answers to questions already asked about PAdES and lets you ask new questions which we will attempt to answer as soon as possible.

PAdES (acronym of PDF Advanced Electronic Signatures) is a set of standards published by ETSI (TS 102 778 parts 1 to 5) to support European requirements for electronic signatures. PAdES is based on existing PDF Signatures as specified in ISO 32 000. It includes features to support validation of signatures which are stored for years or even decades.

The site is aimed at implementers of PAdES as well as those considering whether PAdES is appropriate to their needs.

Implementing PAdES Part 2

ID #1020

040. I have read that the revocation information should be embedded within the PAdES Part 2 signatures by the signatory and that it should be validated before signing. Why PAdES introduces this requirement, which, by the way, is not mentioned neither in CAdES nor in XAdES?

The immediate answer is that this is a recommendation inherited from ISO 32000.  Being PAdES Part 2 a profile of ISO 32000, the standardization committee decided to preserve recommendations made by ISO within this profile. Only certain optional features were dropped in the profile.

This feature does allow the signer to provide information that may be used by the verifier to avoid having to obtain this information itself.  This may be considered, however, to have inherent weakness as the source of revocation information is chosen by the siigner not the party verifying the signature.  Verifiers may ignore such a revocation information "in favour of alternative storage or referenced data as per its own policies".

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Last update: 2009-11-23 16:28
Author: Joan Carlos Cruellas
Revision: 1.5

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