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Insecure auth key using rand()

Related to this line:

$authKey = md5(rand());

It has been known that using rand() is insecure. In order to add a bit more randomness, the following should be used:

md5(openssl_random_pseudo_bytes(16));

This will create an output like so: 7dc7f61022b2a88df34c1e476ea078ff

MD5 is not really necessary. To avoid collision even more, an authorization key should be removed completely after a user is authorized, resulting in the authorization key getting recycled. Unauthorized keys should be removed after 7 days of not being authorized.

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