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        Title           : Real-time Certificate Status Facility for OCSP - 
                         (RTCS)
        Author(s)       : P. Gutmann
        Filename        : draft-gutmann-ocsp-rtcs-00.txt
        Pages           : 0
        Date            : 2003-1-13
        
When the OCSP protocol was defined, the design was based on full compatibility with 
CRL-based mechanisms.  This requires the use of a complex means of certificate 
identification that has resulted in interoperability problems among implementations, a 
design unsuited for high-throughput, real-time operation, the inability to provide an 
unambiguous certificate status response (the only thing that a CRL can say with 
certainty is 'revoked'), and an online responder tied to an offline mechanism (some 
CAs issue CRLs only once or twice a day, even though they have an online, real- time 
certificate store
available).  A more practical problem is that it makes it impossible to
implement an OCSP responder not based on CRLs, for example one that consults a 
certificate database or in-memory hash table to determine the presence or absence of a 
valid certificate.

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