Best Practices

Robert J. Hansen rjh at
Sun Dec 12 17:21:13 CET 2010

On 12/12/2010 10:23 AM, Daniel Kahn Gillmor wrote:
> What part of OpenPGP certificates require SHA-1?

... At first blush, V4 certificate checksums, symmetrically encrypted
integrity protected data packets, the MDC system in general, certificate
fingerprints, etc.  I just grepped through the RFC looking for any
hardcoded SHA-1; David is probably a much better reference than I am on

Probably the most annoying -- to me, at least -- is the fingerprint
requirement.  If a preimage collision is discovered in SHA-1 then it's
all over.  I can take your signature on my enemy's key, graft it onto my
own impersonator of my enemy's key, and then get others to believe it.

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