Computer must be connected to internet while validating digital signature. Download your E-Aadhaar and open the pdf in Adobe Reader only Right click on the 'validity unknown' icon and click on 'Validate Signature' You will get the signature validation status window, click on 'Signature Properties'. Click on 'Show Signer's Certificate.' Verify that there is a certification issued by the name '(n)Code Solutions CA 2014'. On Summary page(tab), Click on 'Export' Click 'Next' to save the certificate in your local system (Desktop/Laptop). After that click 'Next' and then 'Finish' Click on 'Trust' tab, then Click on 'Add to trusted certificate'. After that Select all three options under 'Certified documents' and click 'Ok' Click again on 'Validate Signature' and close the window Once ' (n)Code Solutions CA 2014' has been as a Trusted Identity, any subsequent documents with digital signatures from CCA will be validated automatically when opened. In case Certificate validity is seen to have an expired certificate, on the machine; you are requested to download the E-Aadhaar once again and re-validate the signature, using the said procedure given in above points and add the newly downloaded certificate again to 'Trusted Certificate' category on local machine for adding valid/current digital certificate. The invalid digital signature on the downloaded e-Aadhaar can also be validated on another machine, other than the machine where it was downloaded i.e. Laptop/Desktop. However, for this document to be validated, the digital certificate needs to be downloaded and validated as per the procedure above on the alternate machine. Note: - Once 'NIC sub-CA for NIC 2011, National Informatics centre' has been as a Trusted Identity, any subsequent documents with digital signatures from CCA will be validated automatically when opened