Which Property is unique among all certificates in Certificate Store?

Question

Hello,

I am trying to create an application for which a user selects a X509 certificate from Certificate Store. Once user selects then I want to store some unique property of that certificate and save it in user’s local computer. Now when user starts this application again then I want to retrieve that certificate automatically from Certificate Store (with the help of unique property which is stored in a local computer).

Which unique property should I use?

1.       Certificate’s Serial Number or

2.       Certificate’s Thumbprint

I want to know that which property will be unique among all certificates which are stored in Certificate Store so that I can find my particular certificate from Certificate Store.

Answer 1

Thumbprint.

Serial numbers are only unique for the same CA.

       -Steve

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