7.2 Authentication

Authentication is the process of ensuring that a user of your system is who they claim to be. You need authentication in all software products that maintain user information so that only the providers of that information can access and change it. You also use authentication to learn about your users so that you can personalize their experience of using your product.

Authentication in software products is based on one or more of three approaches—namely, user knowledge, user possession, and user attributes (Figure 7.4).

An illustration depicts the three approaches used by an authenticating user.

Figure 7.4

Authentication approaches

Knowledge-based authentication relies ...

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