While light-weight pdf readers are a very good alternative to "Adobe Reader" and there are more reasons other than just the bloat to use them, but there are times when a user needs to rely upon the official PDF reader from Adobe. Today we will see how to use free utility software "Adobe Reader X" to digitally sign a document, a digital signature or e-signature is a mathematical encryption technique used to ensure authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, and that it was not altered or tampered with in-transit.
- Open the PDF file/form you need to digitally sign using "Adobe Reader X" or later version.
- Click the "Tools" option and a new panel will appear with "Sign Document" option.
- Clicking the "Sign Document" button will open another dialog-box as shown below with all the "Digital Signatures" available on current machine, select the desired signature and and click "Sign".
- You should now be asked for "PIN" or "Password" needed to sign the document using that identity/digital signature.
- Once completed your PDF file get signed as shown below.
Voila, you now have a digitally signed document. Government e-forms usually require this type of e-signatures to verify authenticity of the document creator/filler.