[Tokend-Dev] How to clear Safari SSL cache

[liuddd]

Hi, everyone!
        I found after I plug out my ccid reader and after my tokend process exits normally, I can still visit the SSL web page. 
        How can I clear the SSL login cache after plug out the reader or smardcard?
        I found there's a certificate identity preference item left in the Keychain, how can I delete the certificate identity preference item using Keychain API or some shell scripts. 
        Thank you! 
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