An attacker runs netcat tool to transfer a secret file between two hosts.

Machine A: netcat -l -p -s password 1234 < testfile

Machine B: netcat 1234

Machine A: netcat -l -e magickey -p 1234 < testfile

Machine B: netcat 1234

Machine A: netcat -l -p 1234 < testfile -pw password

Machine B: netcat 1234 -pw password

Use cryptcat instead of netcat