A very simple script to generate site passwords from a master password and a site name.
Does so in such a way as to make the master password basically unguessable, and the resulting site password will also have many bits of entropy making it very hard to guess.
To be technical, it runs 200000 iterations of PKCS#5 v2.0 PBKDF2 with the master password as the key and the site name as the salt and base64 encodes the result (plus a bit of modification) to generate the site password.
A Javascript version that relies on sjcl is in here now, and it needs a web page wrapper. Hopefully, an Android applet version will also be added soon.
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These details are provided for information only. No information here is legal advice and should not be used as such.