I would recommend reading those two IETF RFCs - they have all the details.
On 8/22/11 2:17 AM, "sam_dev" <[email protected]> wrote: >Hiii , > I need your help regarding pdf password >decryption. I have done the decryption of 128 bit RC4 and 128 bit AES >passowrd security but now I have to decrypt the 256 bit password security. >As according to the ISO 32000:1 document, Algorithm 3.2a Computing an >encryption key, I am not able to understand its first step: > > >1. The password string is generated from Unicode input by processing the >input string with the SASLprep >(IETF RFC 4013) profile of stringprep (IETF RFC 3454), and then converting >to a UTF-8 representation. > > >In this i am not able to understand anything about SASLprep profile of >stringprep. If anyone can please explain me something about it. I will be >really grateful to him/her. > Thanks >DevSam > >-- >View this message in context: >http://itext-general.2136553.n4.nabble.com/256-bit-AES-algorithm-pdf-passw >ord-decryption-tp3759415p3759415.html >Sent from the iText - General mailing list archive at Nabble.com. > >-------------------------------------------------------------------------- >---- >uberSVN's rich system and user administration capabilities and model >configuration take the hassle out of deploying and managing Subversion >and >the tools developers use with it. Learn more about uberSVN and get a free >download at: http://p.sf.net/sfu/wandisco-dev2dev >_______________________________________________ >iText-questions mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/itext-questions > >iText(R) is a registered trademark of 1T3XT BVBA. >Many questions posted to this list can (and will) be answered with a >reference to the iText book: http://www.itextpdf.com/book/ >Please check the keywords list before you ask for examples: >http://itextpdf.com/themes/keywords.php ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. Learn more about uberSVN and get a free download at: http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions iText(R) is a registered trademark of 1T3XT BVBA. Many questions posted to this list can (and will) be answered with a reference to the iText book: http://www.itextpdf.com/book/ Please check the keywords list before you ask for examples: http://itextpdf.com/themes/keywords.php
