Personal Certificates Renew

We have a InfoPath form that people sign using personal digital certificates.  I can see the certificates in Internet Explorer by going to  Tools/Internet Options/Content/Certificates.  

The Issued To and Issued By match the login of the user, however the Expiration Date has past. How can I renew those personal certificates in order to not invalidate our singed forms.  Thanks!

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ParanormasticCryptographic EngineerCommented:
For signing, you should really get a proper commercial signing certificate - an email signing cert should be good enough to fit the bill - you can get these from a number of commercial CAs (verisign, globalsign,etc.)  for 20 bucks - not sure if anywhere offers them for less unless you buy in bulk (if so talk to sales).  The reason for this is timestamping - you can still validate the timestamp long after the original certificate has expired to say that the cert was actually valid at the time that the timestamp was applied.

In order for existing forms to not come back with an error stating that the cert used to sign has expired, then you  need the timestamping - or you need to use a new cert to go back every year or whatever and sign everything all over again, which gets kind of fuzzy if you don't track when you re-signed each individual document.

If you are a larger company you might look into a timestamping server - these aren't exactly cheap (offhand about 15k).

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