scope:

The present document profiles the electronic signature formats found in ISO 32000-1 [1] to support Long Term Validation (LTV) of PDF Signatures. This profile does not repeat the base requirements of the referenced standards, but instead aims to disambiguate between the techniques used in the different referenced standards.

The present document specifies how to include validation information in a PDF Document and to further protect the document using time-stamps so that it is possible to subsequently verify a PDF Signature long after it was signed. This profile may be used to support long term validation of:

a) PDF Signatures to profiles specified in TS 102 778-2 [i.4]; or

b) PDF Signatures to profiles specified in TS 102 778-3 [i.5]; or

c) PDF Signatures to profiles specified in TS 102 778-5 [i.6].

The present document specifies a profile to support the equivalent functionality to the signature forms CAdES-X Long and CAdES-A as specified in TS 101 733 [2] in a single profile PAdES-LTV (see annex B for further information on matching this profile to CAdES signature forms).

The same LTV mechanism specified in this profile is used to support the equivalent to all the signature forms XAdES-XL and XAdES-A as specified in TS 101 903 [3], by upgrading XAdES signatures aligned with the profile defined in clause 5.2 of TS 102 778-5 [i.6] (see annex A of TS 102 778-5 [i.6] for further information on matching this profile to XAdES signature forms).

The present document also specifies extensions to ISO 32000-1 [1] to provides features required to support LTV (see annex A).

NOTE: It is planned to submit these extensions to ISO as a proposal for a revision to ISO 32000-1 [1]. If accepted, future versions of this profile may reference any future ISO standard instead of the extensions specified in annex A.

This profile is applicable to any party relying on a signature over a long period (e.g. longer than the lifetime of the signing certificate). It may be applied by a party receiving and verifying the document or the signing party who should also verify the document when applying LTV.

The present document is part of a series of profiles for advanced electronic signature formats applied to PDF documents. General information on the series of profiles is specified in TS 102 778-1 [i.3].

The requirements specified in the present document take precedence over those specified in ISO 32000-1 [1].