Identifies the device MAC address of the requesting site and feeds it back to the user using a random code calculated by the MAC address

For each request site of the device terminal, get its MAC address (or IP line), and then use the algorithm f (MAC) = verification Code p, return p to the device Terminal page, the user input the verification code p, as a sign-in!
The principle is so, how can I do it?
Ask experienced, thought-minded it peers to help

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For each request site of the device terminal, get its MAC address (or IP line), and then use the algorithm f (MAC) = verification Code p, return p to the device Terminal page, the user input the verification code p, as a sign-in!
The principle is so, how can I do it?
Ask experienced, thought-minded it peers to help

First, there is no way to get the client Mac address on the Web server without installing the plugin on the client side.
And with IP words, 截至到2013年6月底，全球IPv4地址分配总数共计 3,504,465,208个 (from the network). If you need to verify that the code is completely non-repeatable, at least 10 bits, that is not as good as the direct use of IP as a verification code.
Therefore, a more feasible solution is to put the verification code and IP corresponding relationship with the database or other means of storage. If the generated verification code repeats, then another one. So the specific algorithm is very arbitrary, for example, with MD5, and then take a first few converted to an integer type.

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