stop user copy and paste cookies in other browser for login in codeigniter

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I have an application in Codeigniter a simple login form. if the user login in browse (A) and copy the login cookies. Now paste this cookie in browser (B) the user is login without any authentication how can stop this.

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Tore Nestenius On

You can use a technique called finger printing, to create a checksum of the browser when the user initially logs in, then at certain points, you can check if the fingerprint is the same as before.

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