Adobe 22002484 User Guide - Page 253

USING ACROBAT 9 STANDARD 248 Digital signatures 2 To automatically validate all signatures in a PDF when you open the document, select Verify Signatures When The Document Is Opened. This option is selected by default. 3 Click Advanced Preferences, and then click the Verification tab. 4 Select verification options. 5 (Windows only) Click the Windows Integration tab, and specify whether you can import identities from the Windows Certificates feature into the list of trusted identities. In addition, specify whether to trust all root certificates in the Windows Certificates feature when validating signatures and when validating certified documents. Selecting these options can compromise security. Note: It is not recommended to trust all root certificates in the Windows Certificate feature. Many certificates that are distributed with Windows are designed for purposes other than establishing trusted identities. Verification options When Verifying These options specify methods that determine which plug-in to choose when verifying a signature. The appropriate plug-in is often selected automatically. Contact your system administrator about specific plug-in requirements for validating signatures. Require Certificate Revocation Checking To Succeed Whenever Possible During Signature Verification Checks certificates against a list of excluded certificates during validation. This option is selected by default. If you deselect this option, the revocation status for approval signatures is ignored. The revocation status is always checked for certifying signatures. Verify Signatures Using Select an option to specify how to check the digital signature for validity. You can check by the current time, by the time set by a timestamp server when the signature was signed (the default), or by the time the signature was created. Use Expired Timestamps The validation process uses the secure time provided by the timestamp or embedded in the signature, even if the signature's certificate has expired. This option is selected by default. Deselecting this option allows discarding of expired timestamps. Signatures panel overview The Signatures panel displays information about each signature in the current document and the change history of the document since the first signature. Each signature has an icon identifying its verification status. Verification details are listed beneath each signature and can be viewed by expanding the signature. The Signatures panel also provides information about the time the document was signed, and trust and signer details. Verify signatures in the Signatures panel. Last updated 9/30/2011