I've been looking into user authentication. It is quite a challenge, considering all issues involved. We want users to be able to log in to Math Empire using accounts they already have registered with other services. If we let users sign in with their Google account for example, we can let Google worry about most issues associated with user authentication. Nice! But still, if we are to support multiple services we will have to differentiate these at some level. I've been looking at OpenID lately, which looks promising.
Ideally, there would be a single common interface towards different services, and an implementation of that protocol could be used to authenticate users from whatever service supporting it. Sure, such a wide perspective has its own set of drawbacks, but it sounds great anyway!
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