Using gpg-authenticated debian-archives

read http://wiki.debian.org/SecureApt

do this inside the nfsroot if needed:

apt-get install gnupg debian-keyring 
gpg --recv-keys 4F368D5D

(adjust the key ID as needed)

Adding

FAI_DEBOOTSTRAP_OPTS="--include=gnupg" 

to make-fai-nfsroot.conf then you don't need to install gnupkg manually.

For people running an archive repository

(taken from http://wiki.debian.org/apt06 - go to that page and read it!)

If you run a archive make sure that you have a toplevel Release file (create it with apt-ftparchive release) and sign it a key (with gpg -abs -o Release.gpg Release). Then tell your users what key they need to import.

howto create a local mirror incl. security.debian.org

http://www.psycast.de/blog/?postid=30 (german, will do a translation soon)