On Jan 28, 2009, at 6:06 PM, Sven Radde wrote:
Hi gnupg-users!
I noticed some "oddities" (to me) with the selection of a hash
algorithm
by GnuPG. I assume that the particular use-cases have additional
limitations which are not obvious to me, so could you please clarify?
First, when sending a signed email from Evolution, SHA1 seems to be
chosen, no matter what "personal-digest-preferences" or even
"digest-algo" is set in the gpg.conf file (other parts of gpg.conf are
honored, however).
Is this a limitation of the PGP/MIME standard that Evolution uses?
No. OpenPGP/MIME can use any hash that OpenPGP can. Possibly
Evolution is overriding the gpg.conf setting for your hashes?
Second, when using the smartcard, and "personal-digest-preferences
SHA256 RIPEMD160", the latter is chosen as digest algorithm.
Is the smartcard limited to 160 Bit hashes?
Yes. Or at least the current one is. There is a new version of the
spec that allows for more hashes, but I don't believe there is a
physical card based on the updated spec that you can purchase yet.
David
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