An anonymous reader writes: OAuth 2.0 is one of the most used single sign-on systems on the web: it is used by Facebook, Google, Microsoft, GitHub and other big Internet companies. A group of researchers from University of Trier, Germany, have performed the first formal security analysis of the OAuth 2.0 standard, and have discovered two previously unknown attacks that could be mounted to break authorization and authentication in OAuth. However, says the article, "[w]ith these problems solved, the researchers ultimately concluded that OAuth 2.0 is secure enough to provide both authorization and authentication -- if implemented correctly."
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