• Usability Research on Federated Login (Google OAuth & Federated Login Research)
  Federated Login has been a "holy grail" in the identity community for a long time. We have known how to do the technical part for a long time. However the industry has constantly tried, and failed, to find a model that was (1) simple for end users, and (2) had a reasonable trust model between the RP (the relying party, which is the site you want to log into) and the IDP (the identity provider, who will identify you to the RP). Google has been experimenting with different user interface models for federated login using the following design principles:
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