eSignatures

Hello John,

1: To validate a digital signature, Set your signature verification preferences. For more information, see Set signature verification preferences.

• Open the PDF containing the signature, then click the signature. The Signature Validation Status dialog box describes the validity of the signature.
• For more information about the Signature and Timestamp, click Signature Properties.
• Review the Validity Summary in the Signature Properties dialog box. The summary might display one of the following messages:

Signature date/time are from the clock on the signer's computer. The time is based on the local time on the signer’s computer.

Signature is timestamped: The signer used a Timestamp Server and your settings indicate that you have a trust relationship with that timestamp server.

Signature is timestamped but the timestamp could not be verified: Timestamp verification requires obtaining the timestamp server's certificate to your list of trusted identities. Check with your system administrator.

Signature is timestamped but the timestamp has expired: Acrobat and Reader validate a timestamp based on the current time. This message is displayed if the timestamp signer's certificate expires before the current time. To let Acrobat or Reader accept an expired timestamp, select Use Expired Timestamps in the Signature Verification Preferences dialog box (Preferences > Signatures > Verification: More). Acrobat and Reader display an alert message when validating signatures with the expired timestamp.

• For details about the signer’s certificate, such as trust settings or legal restrictions of the signature, click Show Signer’s Certificate in the Signature Properties dialog box.

If the document was modified after it was signed, check the signed version of the document and compare it to the current version.

For detailed information, you may refer to Adobe article Validating digital signatures, Adobe Acrobat

2: To create a digital id, you can refer to the Adobe article Digital IDs in Acrobat

Feel free to update this discussion for any further assistance.

Regards,

Anand Sri.