An anonymous reader writes: I want to connect 2 computers so that they can exchange data securely.
Computer A wouldn't be connected to anything except to computer B and should be safe at all cost from remote attacks.
Computer B would be connected obviously to computer A and to the internet.
The communication between A and B would consist of encrypted data sent by a custom software written by me.
A knows how to decrypt the data, but B doesn't.
If I connect A and B with a RS232 cable, can a remote attacker take control of A if he has control of B ?
I understand that if B is compromised, the attacker can monitor the communications, corrupt them etc ... but can he take control of A ?
A colleague of mine tells me it's impossible, but I'd rather be sure.
My original idea was to create a kind of telegraph to make the 2 computers communicate throught Morse code.
Thank you for your input.
Please note that English is not my mother tongue, please forgive me for any error that I might have left out.