Glam,
Glam wrote: > > is it possible (according to the PDF standard, and in iText) to have two > signatures for the same revision? just one afterthought... if you seriously want to be in the signature business, you should not only keep in mind the current plain PDF standard (i.e. ISO-32000-1:2008) but also additional standards. E.g., confer ETSI TS 102 778-1; section 4.1 in v1.1.1 says: "As with other CMS-based signature implementations, a digest is computed over a range of bytes of the file. However with PDF, as the signature information is to be embedded into the document itself, this range is the entire file, including the signature dictionary but excluding the PDF Signature itself. The range is then indicated by the ByteRange entry of the signature dictionary. By restricting the ByteRange entry this way, it ensures that there are no bytes in the PDF that are not covered by the digest, other than the PDF signature itself. NOTE: The profiles defined in part 2 and 3 make normative this requirement which is a recommendation in ISO 32000-1 [1], clause 12.8.1." Therefore, as soon as you're into signatures seriously, the signed byte range simply has to cover all of the revision but the one signature container which signs this very byte range. Regards, Michael. -- View this message in context: http://old.nabble.com/Multiple-signatures-and-multiple-revisions-tp26536564p26588118.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
