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How do you solve multi-device login? Also, that seems to require JS, which may or may not me a problem.



first of all, it doesn't have to be mandatory. classic auth via user/pw entry could still co-exist.

multi-device auth is possible too: each device could generate a client cert. the authenticator would have to be able to link multiple certs to a user account.


If you can use a password to generate/link a new certificate, wouldn't that mean the weakest link is again the password? Sorry if I am misunderstanding, it's a very interesting topic but I'm not sure I get it :)


it depends on how it gets implemented. if you decide that classic user/pw auth should co-exist it is of course still the "weakest link". sharing certificates across devices is also possible. os-x mavericks supports this natively with the new icloud keychain. although that might not be what you want, security-wise.


There's an issue with switching between using a password and a certificate: the password will end up being forgotten. You can probably solve this with email resets, but it's worth thinking about.




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