Key ID format: short or long?

Michael Kesper mkesper at
Sun Oct 26 20:33:05 CET 2008


* Jens Peter Secher <jpsecher at> [2008-10-26 15:05:51 +0100]:
> 2008/10/22 Michael Kesper <mkesper at>:
> > what: There were collisions with other existing keys if you only would have
> > looked at the last 8 chars of the fingerprint.
> >
> That was quite unlucky, because there should be approximately 77000
> people gathered together to get a probability of 50% of a collision,
> according to :-)

I double-checked. There were no collisions among the participating people
but some of the participating keys short IDs collided with other existing
short IDs.
So, to be sure, always use 16 digits.

Best wishes
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