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

Local deb repository

cp /path/to/*.deb ~/repo/debs

cd ~/repo/debs

sudo dpkg-scanpackages . /dev/null | gzip -9c > Packages.gz

Usage:

{editor} /etc/apt/sources.list

deb file:/home/username/repo/debs/ /