Acrobat 9 Family of Products
Security Feature User Guide
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5.1.2 Supported Seed Values ............................................................................................................................................69
5.1.3 Enabling JavaScript to Set Seed Values..............................................................................................................70
5.2 Forcing a Certification Signature ....................................................................................................71
5.3 Giving Signers the Option to Lock a Document .............................................................................73
5.4 Forcing Signers to Use a Specific Signature Appearance ..............................................................74
5.5 Adding Custom Signing Reasons ....................................................................................................75
5.6 Specifying Timestamps for Signing ................................................................................................76
5.7 Specifying Alternate Signature Handlers and Formats.................................................................77
5.8 Specifying a Signature Hash Algorithm..........................................................................................79
5.9 Embedding Revocation Information in a Signature ......................................................................79
5.10 Specifying Certificate Properties for Signing...............................................................................80
5.10.1 Specifying Signing Certificates Origin..............................................................................................................82
5.10.2 Specifying Certificates by Key Usage................................................................................................................83
5.10.3 Specifying Certificates by Policy.........................................................................................................................84
5.10.4 Specifying a URL When a Valid Certificate is not Found............................................................................85
5.10.5 Restricting Signing to a Roaming ID .................................................................................................................86
5.11 Custom Workflows and Beyond ....................................................................................................86
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Signing Documents ..............................................................................................................89
6.1 Signing Basics....................................................................................................................................89
6.1.1 Before You Sign . . ......................................................................................................................................................89
6.1.2 Signature Types...........................................................................................................................................................89
6.1.3 Signing User Interface...............................................................................................................................................90
6.2 Signing With a Certification Signature ...........................................................................................90
6.2.1 Certification Workflow for Documents with Multiple Signers ...................................................................92
6.2.2 Setting up a Document for Certification............................................................................................................93
6.2.3 You can customize the way a certified document behaves for signers by giving form fields
additional features with seed values. For example, you can preconfigure custom signing reasons or
limit signing to only those with certificates with predefined characteristics. Certifying a Document .
93
6.2.4 Certifying a Dynamic Form .....................................................................................................................................95
6.2.5 Why Can’t I Certify? ....................................................................................................................................................96
6.3 Signing with an Approval Signature ...............................................................................................96
6.3.1 Signing Documents in Acrobat .............................................................................................................................96
6.3.2 Signing in a Browser..................................................................................................................................................98
6.3.3 Clearing One or More Signatures .........................................................................................................................99
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Validating Signatures ....................................................................................................... 100
7.1 Signature Validity Basics............................................................................................................... 100
7.1.1 What Makes a Signature Valid? .......................................................................................................................... 100
7.1.1.1 Authenticity Verification ............................................................................................................................. 101
7.1.1.2 Document Integrity Verification............................................................................................................... 101
7.2 Setting up Your Environment for Signature Validation ............................................................. 102
7.2.1 Validating Signatures Automatically ................................................................................................................ 102
7.2.2 Setting Digital Signature Validation Preferences......................................................................................... 103
7.2.3 Using Root Certificates in the Windows Certificate Store......................................................................... 104
7.2.4 Validating Signatures with Timestamps and Certificate Policies ........................................................... 105
7.3 Validating Signatures Manually ................................................................................................... 106
7.3.1 Validating Signatures with Adobe Reader ..................................................................................................... 106
7.3.2 Validating a Single Signature in Acrobat ........................................................................................................ 106
7.3.3 Validating All Signatures in Acrobat................................................................................................................. 107