Authentication in web application
The authentication mechanism is logically the most basic dependency in an
application’s handling of user access. Authenticating a user involves establishing
that the user is in fact who he claims to be. Without this facility, the application
would need to treat all users as anonymous — the lowest possible level of trust.
The majority of today’s web applications employ the conventional authentication model, in which the user submits a username and password, which the application check the validity
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