There are other differences:
        CRL's can be big
        An org might consider its CRL private info ("ooh look, Fred must have 
gotten fired")
        It's hard to *prove* you consulted a CRL; for OCSP use a hash of your 
"real" document as the nonce, and save the response.
        An OCSP responder can work off "faster" information than just the CA's CRL.

hope this helps.
        /r$


-- 
Zolera Systems, http://www.zolera.com
Information Integrity, XML Security

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