OpenID/Debian PRNG/DNS Cache poisoning advisory
Peter Gutmann
pgut001 at cs.auckland.ac.nz
Fri Aug 8 13:49:42 EDT 2008
Eric Rescorla <ekr at networkresonance.com> writes:
>It's easy to compute all the public keys that will be generated
>by the broken PRNG. The clients could embed that list and refuse
>to accept any certificate containing one of them. So, this
>is distinct from CRLs in that it doesn't require knowing
>which servers have which cert...
You'd also end up with a rather large list for the client to carry around,
which would be especially problematic for lightweight clients. You'd need to
represent it as something like a Bloom filter to avoid this (given that most
users will just click OK on invalid certs, the small false positive rate
shouldn't have much effect either :-).
Peter.
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