A basic implementation here: http://webpass.rkeene.org/ http://webpass.rkeene.org/ A couple of difficulties your writeup doesn't cover: * password expiry/rota

A basic implementation here: http://webpass.rkeene.org/ http://webpass.rkeene.org/ A couple of difficulties your writeup doesn't cover: * password expiry/rotation - webpass uses the "sequence number" for this, and sequence numbers can be saved in localStorage or shared online through another channel * policies. The "Site" dropdown references a json structure which can specify min/max lengths, character type rules etc The implementation is pretty simple, but that's kinda the point :).