Aldo,
ABU-7 wrote: > > I understand that the free/wild use of ByteRange could create signatures > hard to validate, or even hard to visualise (.. what the hell the user > has signed ? ..). > > However, these recommendations are just practical constraints imposed for > an easy/robust validation procedure. > As the ETSI references you've been given show, the restrictions on the byte range aren't mere recommendations as soon as you're into andvanced electronic signatures, they are hard rules. > My hope is that the validation procedure could be extended for handling > these cases. > My experiment is an hacking work aimed to demonstrate a practical solution > to the parallel-signatures problem. > Parallel signatures in the PDF context are realized using serial signatures, an acceptable solution as long as the document isn't to be signed sumultaneously at the same time by different persons. > Of course this solution works only if the (Acrobat) validator acknowledges > this uncommon use of ByteRange. > No, you can also write an appropriate Acrobat plugin for your special signatures and distribute among those who intend to respect this special kind of signatures. > Try to imagine a certified document with 2 or more empty signature fields > (like the one attached in my original email). [...] > Considering how Adobe made signature interpretation more strict since version 9 of Reader and Acrobat, I doubt they'll follow that trail. Furthermore this is not as intuitive concerning the signing process as the "Adobe way". Regards, Michael. -- View this message in context: http://www.nabble.com/Uncommon-ByteRange-entry-in-signature-dictionary-tp23670277p23687256.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ 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/
