Idea:
When creating accounts on hundreds of different Internet stores, forums, news sites, etc., it is tempting but insecure to just use a single password. Sub-passwords get around this problem by hashing a single password with the address of the site in order to generate a unique password for every site which can easily be re-generated by knowing the master password. Unfortunately, using a scheme like this means that the sub-passwords can be pretty hard to remember themselves. This isn’t a problem when on your own computer, but while traveling its a pain. A generator written in Java or j2me instead of php or perl would allow it to be run not just on your primary computer, but also on a palm or java-capable phone, a big win.
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