Question about details of key sigining

Daniel Kahn Gillmor dkg at
Mon Apr 25 05:10:54 CEST 2011

On 04/23/2011 06:11 AM, Quequanys wrote:
>  When you sign someones keys, does it 
> mean that their public key (with uids) is hashed 
> and the hash is encrypted, or maybe there is no 
> hashing and signing means only encryption of the 
> public keys and uids? Could you point me to 
> specific portions of documentation that cover this 
> issue?

Each User ID is signed separately.

For a certification over a Key + UID, the public key, user ID, and any
other subpackets (chosen by the certifier) are digested against a
specially-chosen prefix (a different prefix than the prefix used for
data signatures).

I believe you're interested in this section of the OpenPGP specification:



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