The OpenPGP standard defines several different types of signatures. This policy page concerns itself with the types of signatures on public keys, specifically types 0x10, 0x11, 0x12, and 0x13. (In GnuPG 1.0.7, these are represented as numbers from 0 to 3 on the signature. If the number is not shown, it is assumed to be 0.) This document will refer to these signatures as "trust levels", ranging from 0 to 3.
This document may, from time to time, be changed without notice. Should any trust criteria be changed in a manner that affects previously-signed keys, differences will be noted for the affected date ranges.
Keys signed with a trust level of 1 indicate that I have done
cursory verification of the person's identity, and either:
|2||Keys signed with a trust level of 2 indicate that I have personally, though casually, known the key owner for some time and reasonably believe them to be who they claim. I am almost certain that the email address on the uid(s) signed is a valid email address for the key owner.|
|3||Keys signed with a trust level of 3 indicate that I have personally known the key owner for quite some time, and genuinely believe them to be who they claim. I either routinely exchange email with them at the requested address, or know with a great degree of certainty that their email address is valid.|
Individual justifications for signatures made after 2002-09-01 (September 1, 2002), can be found here.
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