Usage:

python twit.py [-d] -m "hello world" -k "This is a test key"
python twit.py [--decrypt] --message="hello world" --key="This is a test key"

The key needs to be a multiple of 8 bytes (up to a maximum of 56)

The message should be short (the encrypted message needs to be less than 140 characters)

Security:

I believe this to be secure but don't offer any gaurantees.
You need to find a way of sharing the key safely.

Todo:

Add an option to not send the message to Twitter (for testing purposes or sending via sms)

Contact:

Alice Kaerast <kaerast@qvox.org> <http://privacybox.de/kaerast.msg>

Licenses:

twit.py: Use as you like <kaerast@qvox.org>
blowfish.py: GPL <http://ivoras.sharanet.org/projects/blowfish.html>
twitter.py: Apache License <http://code.google.com/p/python-twitter/>