Problems with apt-get update

[KlauX Anderson <klaux1@yahoo.com.br>]

Hello all,

I'm having problems with ap-get update.

This message:

W: GPG error: ftp://ftp.debian.org sid Release: The following signatures 
couldn't be verified because the public key is not available: NO_PUBKEY 
F1D53D8C4F368D5D
W: GPG error: ftp://ftp.debian.org ../project/experimental Release: The 
following signatures couldn't be verified because the public key is not 
available: NO_PUBKEY F1D53D8C4F368D5D
W: You may want to run apt-get update to correct these problems

My sources.list:

#deb file:///cdrom/ sarge main

deb ftp://ftp.debian.org/debian/ sid main contrib
deb-src ftp://ftp.debian.org/debian/ sid main contrib

#deb http://security.debian.org/ stable/updates main
#deb ftp://ftp.nerim.net/debian-marillat/ unstable main

#experimental
deb ftp://ftp.debian.org/debian/ ../project/experimental main
deb-src ftp://ftp.debian.org/debian/ ../project/experimental main
#deb http://pkg-gnome.alioth.debian.org/debian experimental main
#deb-src http://pkg-gnome.alioth.debian.org/debian experimental main

My action:

apt-get install debian-keys -t experimental
gpg --import /usr/share/keyrings/debian-keyring.gpg
apt-get update (after uncomment some sources)
From: "Joseph A. Nagy, Jr." <pagan_prince@bigfire-hsv.org>

This proble persist...

Thx.