Registered 2009-01-03 by Matt Giuca

Reference implementation of the SuperGenPass algorithm in Python. Ported from

This tool generates a unique password for each domain, solving the problem of having to remember a million passwords.

SuperGenPass ( is a JavaScript bookmarklet tool for generating a password based on a hash of your master password, and some domain name. This means you can generate a unique password for each website you use, solving the problem of one bad site getting your main password. But, you don't need to remember anything but your master password.

We have ported it to Python for a number of reasons:

* We want a clearly readable reference implementation of the algorithm, so we know how it works and we can trust it.
* We want to use the tool in a number of forms: on the command line, in a GUI, integrated with the operating system, on mobile devices, etc. Python is widely used and can produce tools in all these forms and more.
* There is a subtle security vulnerability in the JavaScript bookmarklet version -- a malicious site could snoop the master password from the JavaScript form. This vulnerability is not present in offline versions of the algorithm (though this is also true of the "mobile version" provided at

PySGP is that implementation. It should generate the exact same passwords as SuperGenPass 1.3, so you can use the two tools interchangeably. We would like to further this by developing a more rigorous specification of the SGP algorithm, which can be implemented by many tools in a compatible way.

We are currently getting ourselves set up, so there is not a lot of documentation. This tool is in its early stages, so please don't rely on it - use the JavaScript version. If you want to help us out, use our tool as well as the original JavaScript one, and let us know if there are any discrepancies between the two.

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