The web page says:
Packages overview for Matthias Urlichs
General information for Id: smurf@debian.org (click to collapse)
GPG key id not found! (key id was not found neither in the Debian keyring nor on a public keyserver)
... Known bug?
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Matthias Urlichs | {M:U} IT Design @ m-u-it.de | smurf@smurf.noris.de
Disclaimer: The quote was selected randomly. Really. | http://smurf.noris.de
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I never killed a man that didn't deserve it.
-- Mickey Cohen