Is this something that can be used for highly secure information or should it be bypassed for a single site authentication system? This may be a stupid question (as it does not sound secure) but I would like some advice.
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OpenID itself is no less secure than the traditional username+password login.
Obviously, you’re entrusting a large part of the security to the provider – e.g. brute force prevention, password size policy, etc.
Wouldn’t use it for online banking for example, not while the OpenID protocol itself is insecure, but due to the use case.
Financial info? DoD Top Secret? Really secure information isn’t available via the internet, only on the local network or through a VPN, which is moving a chunk of the security to the network level. Really really secure information is on a computer with no network connection…
There is the theory that the user, having just one password to use for their OpenID account, has the possibility to choose a decent strength password, less likely when they have to remember x passwords.