>       As others have pointed out, the DNS already has the capability
>       to store certs.  So you could use the DNS as a publication 
>       method.  But is this the only thing a PKI needs?  How would
>       one revolke a cert that was in the DNS?  How can you update
>       -every- cached copy of the cert in question? 

you don't need to.  there are in general two options for this sort of
thing:

  1) short lived certs
  2) CRL's published at regular intervals.

both involve a regularly-signed short-lived objects.  

                                                - Bill


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