How to verify the digital signatures?

Buyer has to send a certified interactive form to vendor, vendor has to digitally sign the form back. We need to verify the signature of the vendor only then start processing the form. How do I achiev this security. 
1) How do I generate buyer certificate and attach to the form.
2) I have created a signature field in the form, after the vendor signs it how do we check whether its the correct signature?
Kindly specify the steps.
Helpful answers will be rewarded.
Regards,
Vishal

Hi Vishal,
Check this Thread.
Implement Digital Signature in Interactive form
Regards,
Mithu

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