OneTime is an open source encryption program that uses the one-time pad method.
See red-bean.com/onetime for more
information. You can also run ./onetime --intro for an
introduction, or ./onetime --help for complete usage.
OneTime is written in Python, and requires Python 2.6 or higher (but it has not been ported to Python 3 yet — there's an open issue for that and patches are very welcome).
Please use the GitHub repository for filing issues or submitting pull requests. OneTime's source code is heavily commented; any question you might have about design or implementation is probably answered there. If you're writing a patch or a pull request for OneTime, be sure to include a new regression test in check.sh.