I have a dead tree document. In order to reduce the risk of being compromised, I would like to digitize and encrypt the document, and then destroy the physical copy.
Let's assume my computer itself is secure (since if not, this discussion becomes moot). Let's further allow that I am very paranoid and suspect the scanner as the weak link in the chain.
Is it common for scanners to somehow cache or log documents they scan (on the scanner machine itself)? Does scanner driver/software often have temporary folders which end up leaving a trace of the document? Can a networked scanner maliciously or accidentally distribute the file to third parties (over the LAN/WAN or the internet)?
What steps can be realistically taken to minimize the risk?