Hello,

I'm looking for something i saw ages ago so i know its out there just want to be pointed in the right dorection if possible to know about it again. I'm looking or something that is able to work inside a TCP wrapper and if a file is asked to be servered thats say not in an allow list of IP addresses etc, then that request is acknowledged and sent the file but sent a hevily encrypted version of the file. I know this is possibel it does mean making a change and added edit to some of the fucntions or something i can't remember, but if anyones knows anything that sounds remotely like this stuff please let me know
cherers

Over what protocol are you looking to send this file? You'd need a protocol-specific solution.

Doesn't matter about the protocol, the point of veiw is if an attacker tried to get a copy a file no matter what protocol they were using all they'd end up with is an encrypted file. If a computer in the allowed list tried to get the file then the file stays un-encrypted.

Why don't you just deny access to the attacker?

To be able to do this for "any protocol", you'd need a protocol specific handler for EACH protocol running on the system. At the network level, there is no such thing as a file, only a stream of bytes. FTP, HTTP, and other protocols represent files differently.