No other commonly used single sign-on solution currently exists for public web sites. There are now 165 million registered Passport users and over 200 different commerce websites that use the Passport service. Therefore, it is important to look at both the benefits and the failings of the Passport service. Indeed, since millions of users worldwide have Hotmail accounts that utilize Passport authentication and millions more will most likely use .Net products, the security and privacy concerns of this product bear great scrutiny.
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