GNU/Linux Desktop Survival Guide by Graham Williams
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Signing a Local Repository

There may be key issues with a locally managed archive that is not signed. Even though the AVAIL command will identify that the local archive has preference when it comes to obtaining a package that is available from multiple archives, an authorised archive will always be used in preference. Two solutions are possible. One is to tell wajig not to preference authoritative archives by using the --noauth option.

  $ wajig --noauth distupgrade

The other option is to sign your Release files. Using wajig's MOVE command requires some setting up to have the Release.gpg file created. First, tell apt-move to create the file (and also to maintain both compressed and uncompressed Package files - a requirement of the current apt version) in the configuration file /etc/apt-move.conf:

  PKGCOMP='none gzip'
  SIGNINGKEY=Kayon.Toga@togaware.com

Then ensure Kayon Toga's secret key is available to the root user that runs the apt-move command. You can export the secret key (but do this carefully) with:

  $ gpg --export-secret-keys --no-comment Kayon.Toga@togaware.com > ktskexp

Then add this to root's keys:

  # gpg --import ktskexp

Now remove any passphrase so that the file can be singed in batch mode (required when running apt-move):

  # gpg --edit Kayon.Toga@togaware.com
  Command> passwd

So now apt-move can sign the Release file unattended.

Further explanation is available from http://wiki.debian.org/SecureApt.