Validating a digital signature

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" message Problem: When opening a PDF file containing a digital signature in PDF Converter Professional that was created from a self-signed certificate on another system, the digital signature may display a "Validity Unknown" or "Signature not verified! Note: Digital signatures created from a self-signed certificate in Adobe Acrobat display a question mark and the name of the signer when opened in PDF Converter Professional.Cause: This occurs when the digital certificate and digital signature associated with the PDF file have not yet been verified on the system.Digital signature is an effective way to protect documents from changes and to identify the true sender.Digital signature ensures that the signed document wasn’t changed by anyone other than its author.However, a signature date after the end of the validity of document doesn't make sense, which is the case here.Hence, the problem is with the document signer, and not with the person who was issued this PDF from the Indian government.Note that Windows' "Internet time" function (NTP synchronization) will not work if the time difference between real and your computer's clock is too great.

Actually so many people are getting confused What is Validation of Aadhaar Card.8) Click 'Validate Signature' to execute the validation.means that an expired signature / expired validity is treated as valid.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange 1) Right click on the ‘validity unknown’ icon and click on ‘Validate Signature’.

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