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Hi,
I have implemented a simple authentication scheme; for unauthenticated users index.php shows the LCD display and the Graph. Any request other than getting graph or LCD data is not be allowed if user is not logged in.
The password checking is very crude (a single username and password pair can be specified in user config file).
The lockout mechanism (after too many failed password attempts) is also crude. I save the number of failed attempts and the lock-out expiry time in a file (this file can be accessed by anyone but not edited).
Cheers