Machine B responds with a greeting exactly 1.32 seconds long, with a 1.32 second pause after it.
Machine A responds with a sentence in which the first word is exactly 1.32 seconds long.
Machine B considers the handshake a success and proceeds in machine language.
Surely someone out there is doing audio steganography by modulating the volume/duration of "silence".
Machine B responds with a greeting exactly 1.32 seconds long, with a 1.32 second pause after it.
Machine A responds with a sentence in which the first word is exactly 1.32 seconds long.
Machine B considers the handshake a success and proceeds in machine language.