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Note- Computer must be connected to internet while validating digital signature.

1. Right click on the validity unknown icon and click on Validate Signature.
2. You will get the signature validation status window, click on Signature Properties.
3. Click on Show Certificate..
4. Verify that there is a certification path named NIC sub-CA for NIC 2011, National Informatics Center. This identifies NIC sub-CA for NIC 2011, National Informatics Center as the owner of the digital certificate that has been used when signing the document.
5. Mark the certification path named NIC sub-CA for NIC 2011, National Informatics Center, click the Trust tab and then Add to Trusted Identities.
6. Answer OK to any security question that follows.
7. Check(?) the field for Use this certificate as a trusted root and click OK twice to close this and the next window.
8. Click Validate Signature to execute the validation.
9. Now this will show Signature Valid.
   

Note: - Once NIC sub-CA for NIC 2011, National Informatics Center has been as a Trusted Identity, any subsequent documents with digital signatures from CCA will be validated automatically when opened.