Wednesday, January 5. 2011, 21:24
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personal-digest-preferences SHA2563 defaults to SHA256 if you generate your key with a recent GnuPG version. You can check it with gpg --edit-key [your key ID] and then showpref. For 4, I think it can't be changed at all (though I think it doesn't mean a security threat for collission attacks - still it should be changed at some point).
:signature packet: algo 1, keyid A5880072BBB51E42The digest algo 8 is what you're looking for. 1 means MD5, 2 means SHA1, 8 means SHA256. Other values can be looked up in include/cipher.h in the source code. No, that's not user friendly. But I found no easier way.
version 4, created 1294258192, md5len 0, sigclass 0x13
digest algo 8, begin of digest 3e c3