Using PHP Encryption for Login Authentication

“Following up on “Implementing One-way Encryption in PHP,” my
previous tutorial about using one-way encryption to build a secure
online diary application, this article explores using PHP
encryption for login authentication. It presents the two scripts
that make up the diary application: the login and diary scripts, as
well as the necessary database server connection script.

“We start with the login script.

“The Login Script

“The login script ensures that unauthorized users don’t access
other people’s diary contents. Every user who wants to use a diary
needs to have it registered. The login code below shows both file-
and database-based methods for authenticating a user.”

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