This may be specific to GPG created keys. It is mentioned on the gpgtools.org website, as well as in several key signing party documents.
Wikipedia mentions the following: In PGP, most keys are created in such a way so that what is called the "key ID" is equal to the lower 32 or 64 bits respectively of a key fingerprint. PGP uses key IDs to refer to public keys for a variety of purposes. The Apache Foundation has a section on OpenPGP (http://www.apache.org/dev/openpgp.html#find-key-id-with-fingerprint): From The Fingerprint If you have a fingerprint , then the key ID should be the last 8 digits. For example, the ID of the key with fingerprint: FF96 6261 C995 1DDE BF34 5150 D5D2 BDB5 E2B0 54B8 should be: E2B054B8 This can be confirmed by: $ gpg --list-keys --fingerprint E2B054B8 pub 4096R/E2B054B8 2009-08-20 Key fingerprint = FF96 6261 C995 1DDE BF34 5150 D5D2 BDB5 E2B0 54B8 uid Alice Example (EXAMPLE NEW KEY) <al...@example.org> sub 4096R/4A6D5217 2009-08-20 I'm not sure what the definitive response would be. All keys that I have seen generated in the past 5 years seem to match. Confused, Scott On 2013-10-09, at 5:50 PM, Richard Guy Briggs <r...@tricolour.net> wrote: > On Wed, Oct 09, 2013 at 04:54:06PM -0400, Murphy Scott wrote: >> Technically, you only need the full fingerprint, as the keyid is the last 8 >> hex digits of the fingerprint > > That doesn't work for my older key: > > 2115A82D > 19 6A 8F C2 B5 D8 7A AA 28 E0 FE 26 6F F0 84 9E > >> Scott >> >> On 2013-10-09, at 3:34 PM, Richard Guy Briggs <r...@tricolour.net> wrote: >> >>> On Wed, Oct 09, 2013 at 12:20:32PM -0700, Jean-Francois Messier wrote: >>>> Usually, what are the infos in the email tag line about a PGP/GPG key ? >>>> Is there a format ? I want to update my mail tag with just the right >>>> info. I currently see this from the command line: >>>> >>>> === >>>> pub 2048R/4EFF6649 2013-10-03 >>>> Key fingerprint = 9A07 242C 1AEE 2A0D A0F4 B737 23C6 9C3F 4EFF >>>> 6649 >>>> uid Jean-Francois Messier (New PGP key) >>>> <new...@messier.ca> >>>> === >>> >>> I'd strip it down to these two: >>> >>> PGP KEYID: 3382648E >>> PGP Fingerprint: D9DB 27DF 0066 1098 2085 7E5A 0557 2D63 3382 648E >>> >>> The rest anyone can get from a key server and your uid is in your From: >>> line. >>> >>>> Thanks :-) >>>> >>>> JF >>> >>> slainte mhath, RGB > > slainte mhath, RGB > > -- > Richard Guy Briggs -- ~\ -- ~\ > <hpv.tricolour.net> > <www.TriColour.net> -- \___ o \@ @ Ride yer > bike! > Ottawa, ON, CANADA -- Lo_>__M__\\/\%__\\/\% > Vote! -- > <greenparty.ca>_____GTVS6#790__(*)__(*)________(*)(*)_________________
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