Use SSL/TLS and use client certificates. Issue new users a cert with installation instructions for their web browsers and your web server can be configured to identify them for you. More - you can even lose the need to explicitly 'login' if you want - it can be handled by the SSL/TLS handshake. If you don't want to fork out the money for certs from a retail cert authority, use openssl to generate your own 'CA' and certificates for free.

A little Googling will tell you how.

In reply to Wrong layer by snowhare
in thread Identifying clients by ruzam

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