Currently, many web applications require users to register for a new account. With the proliferation of web applications, it has become impractical to expect users to remember different usernames and passwords for each application. Web Single Sign-On (Web SSO) protocols allow users to use a single username and password to access different applications. This paper examines three Web SSO protocols: SAML Web Browser SSO Profile, WS-Federation Passive Requestor Profile, and OpenID.
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