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Published in:
2013 | OriginalPaper | Chapter
Two-Factor Authentication
Author : Badrinarayanan Lakshmiraghavan
Published in: Pro ASP.NET Web API Security
Publisher: Apress
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A system identifies a user through a user identifier, commonly abbreviated to user ID. The process by which a system confirms that a user really is who the user claims to be is called authentication. We saw in Chapter 5 that there are three types of credentials through which a user can be authenticated: knowledge factor (what a user knows), ownership factor (what a user owns), and inherence factor (what a user is).