Discussions about the structure of the signature value (cryptographic message syntax) and the long term quality of specific signature techniques are beyond the scope of this TechNote. The main purpose of this TechNote is to help manufacturers of PDF/A-1 conforming producers to correctly embed digital signatures. Furthermore, PDF/A-1 does not require that conforming readers be able to validate digital signatures. The semantics of digital signatures is left up to the corresponding signature handlers which are uniquely identified by registered names. on how signatures are created and validated. However, the standard does not make any statements about the semantics, i.e. There are aspects of the digital signature that are impacted by the PDF/A-1 standard, e.g. PDF Reference 1.4 defines how digital signatures are to be embedded into a document. Therefore higher versions than 1.4 are mentioned in this TechNote where appropriate. This applies in particular to digital signatures, where for example the appearance stream must obey the rules of the standard whereas the cryptographic message syntax may conform to newer versions. PDF 1.5, 1.6, 1.7 documents can also be PDF/A-1 confirming if they meet the requirements of the standard. The concept of digital signatures was introduced in PDF 1.3 and thus is part of the ISO 19005-1 standard. They also can be used to authenticate the signers identity and determine the time of signing. Technical Note 0006 – Digital Signatures in PDF/A-1ĭigital signatures are primarily used to check the integrity of the signed part of the document.
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