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Validation

Validation

As you’ve seen in this appendix, certificates use public and private keys and a standardized cryptographic procedure for identification. When you access another person’s details or certificate information or a secure website that presents a certificate as his or her identification, you need to be able to validate the information to make sure that the certificate is accurate, that it hasn’t expired, and that the CA is one that you trust to issue such a certificate. If there are failures along the way, or if there is reason to believe that the certificate may have been compromised, you can check the CA’s Certificate Revocation List (CRL) to see if the certificate has been revoked—“disavowed,” if you like—by the CA. (This process is almost exactly like phoning a credit card company to see if the card that’s being handed to you for payment is in fact authorized for use.)

The Validation options are shown in Figure F-13.


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