Public key for emacs-22.1.tar.gz.sig?

[Jens Lechtenboerger]

Dear maintainers of GNU Emacs,

first of all many thanks for your continued development of my
favorite working environment!

Today I downloaded emacs-22.1.tar.gz and emacs-22.1.tar.gz.sig from 
ftp://ftp.gnu.org/pub/gnu/emacs.  However, I didn't find any hint
where to download the public key to verify the signature.
Could you please put a download link somewhere?  Ideally with
fingerprint and on a different server...

Thanks in advance
Jens

P.S.
> gpg --keyserver subkeys.pgp.net --search-keys 0xBC40251C
sometimes reports
> gpg: key "0xBC40251C" not found on keyserver
Sometimes, it returns a key for Chong Yidong <cyd@stupidchicken.com>