Single Sign-On is when a user can use the same set of authentication credentials to access multiple different services.

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Appropriate password requirements for a login (OpenID) service/provider/delegate/thing

This is with regards* to Stack Exchange's upcoming OpenID provider (and in particular, discussion about password requirements). Currently, password requirements are: Must contain 3 of: lower case ...
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What are the benefits and drawbacks of emailing a user a login token/link?

The Question I was reading a forum last night discussing the idea of emailing a user a login link, much like a password reset link, so they don't require a password. Their email address is already ...