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NiX Proxy Script Security
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A)

The software has been designed keeping security as a top priority.

Because the cache directory has to be chmod 777 (writeable by world) and 
it is publicly available due to the nature of script has been coded.

If you host the script under directory /home/your_user_dir/public_html

For additional security you may want to disable PHP engine for your cache 
directory by adding the following line to your proxy virtual host:

<Directory "/home/your_user_dir/public_html/cache">
	php_value engine off
</Directory>

B)

If the user's IP-address will change during the session (a session hijacking has occurred). The script is protected 
against those attacks and the session will be reset automatically.