What would be a way to transfer files in one direction from internet-facing computerA => air-gapped computerB to protect the files on computerB from unauthorised disclosure, short of using an expensive data-diode?
- The data transfer must be continuous. (cable is ok but not a USB flash drive)
- Only the confidentiality of data in computerB is important. There is no need to protect the integrity of data in computerB.
Consider that computerA may be at a risk of being compromised. What would be the best way to transfer data (mostly pdf files) in one direction? I'm looking for a solution that mostly protects against remote attacks (i.e. confidential files end up on compromised computerA) rather than local attacks (attacker is a few metres from the setup).