Friday, December 15, 2017

Pades A Way to Ensure the Long Term Validation on Signed PDF Documents

Pades A Way to Ensure the Long Term Validation on Signed PDF Documents

PDF signatures are basically used for signing all PDF documents but to make their working better, long term and easy the new term “PadES” has been introduced which is the abbreviation of “PDF Advanced Electronic Signatures” and it is developed a European institute named as European Telecommunications Standards Institute”.


The basic idea behind the PDF advanced electronic signature is to provide signer the opportunity to enjoy the long term validation and long term archiving of his or her electronic documents.


Long Term Validation (LTV) is a term to make sure that the digitally signed PDF document will not be rejected and authenticity of electronic signatures will be lasts for a very long time period. To solve this problem new extended term of PDF signature has been defined so than everyone will be able to make their online PDF signed documents verifiable and achievable for a long time period. This is done by embedding both the revocation information of the digital certificate used to create the digital signature and timestamp information.


Specifications of these PadES signatures are somehow similar to the simple PDF signature in term of providing Integrity, Authenticity and Non-Denial. It also helps to ensure the time stamping of certain PDF document so than the other receiving party can never claim any changes or amendments in the transferred document because the exact time, date of document signing and signer’s identity and attributes will be saved in a cryptographic form in the computer.


As PDF signatures have many other types such as visible, invisible, Certified and Approval PDF signatures, same as PadES are also able to be in a form of visible signatures or invisible signatures. Although we could even say that PDF Advanced Electronic Signatures could fall under the types of PDF signatures.


PDF Advanced Electronic Signatures have different parts to understand it named as Part1, Part2, Part3, Part4, Part5 and Part6 and all parts are the recommendation of ISO-32000 and ISO-32000-1 which is an International Organization for Standardizations. In the first part we can find the basic details about it and about its features, in second part we have the specifications of these signatures, in the third part the explicit policy regarding the electronic signature is defined, than in forth part the way of long term verifying and archiving of document is defined, in the fifth part the way is defined about how one can be able to sign some selected parts of a whole document and how these signatures are able to work for xml contents, at last in the sixth part all the procedure and working of electronic signature is defined in the form of visuals. To understand the working, ability, efficiency PadES and also to know about how we can apply these signatures to sign PDF online documents of one have to read and understand all the six parts of it.


Anna Stacy has in-depth knowledge and experience of PDF signatures. Her basic forte lies within process optimization and process re-engineering, and has a long-term obsession with Pades. She is a leading source of what's hot and what's not in the online digital signature space.




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