apt-ftparchive

thanks: http://nerdica.com/?p=43

apt-ftparchive generate file.conf
apt-ftparchive -c apt-custom-release.conf release /path/to/myrepository/dists/custom > /path/to/myrepository/dists/custom/Release



gpg -bao Release.gpg Release

Clearsigned documents

gpg --clearsign doc

You need a passphrase to unlock the secret key for
user: "Alice (Judge) "
1024-bit DSA key, ID BB7576AC, created 1999-06-04

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

[...]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v0.9.7 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iEYEARECAAYFAjdYCQoACgkQJ9S6ULt1dqz6IwCfQ7wP6i/i8HhbcOSKF4ELyQB1
oCoAoOuqpRqEzr4kOkQqHRLE/b8/Rw2k
=y6kj
-----END PGP SIGNATURE----

credit: http://www.gnupg.org/gph/en/manual/x135.html