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#Digital pdf signature verification
Fully trusting an electronic document by enabling verification that the signed document has notīeen altered and that it was signed by someone the recipient trusts.Moreover, government and enterprise settings often need to impose additional constraints on their signature workflows, such as restricting user choices and document behaviour during and after signing.įor these reasons, the PDF language provides mechanisms for two broad categories of tasks: However, the mere existence of a digital signature is not adequate assurance that a document is what it appears to be. Third-party developers can define their own mechanisms in the form of an Acrobat plug-in signature handler.ĭigital signatures can be used for many types of documents where traditional pen-and-ink signatures were used in the past. Adobe® Reader® and Acrobat® have implemented all of PDF’s features and therefore provide comprehensive support for the authentication of digital data based on public key infrastructure (PKI) technologies. This document describes how digital signatures are represented in a PDF document and what signature-related features the PDF language supports. Non-repudiation- we want assurance that the author can’t deny his or her authorship.The authenticity of the document- we want assurance that the author of the document is who we think it is (and not somebody else).The integrity of the document- we want assurance that the document hasn’t been changed somewhere in the workflow.Nowadays, we can use digital signatures to ensure: On different places in the workflow, at different moments in time, the document can be altered, be it voluntary, for instance to add an extra signature, involuntary, for example due to a transmission error, or deliberately, if somebody wants to create a forgery from the original document.įor centuries, we’ve tried to solve this problem by putting a so-called ‘wet ink signature’ on paper. Furthermore, this document probably has to be mailed to, viewed and stored by different parties. You don’t want people to deny the commitments they’ve written down. Such a document may contain important information about rights and obligations, in which case you need to ensure its authenticity.
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