This is a bit like trying to solve one of @Darlinboy ’s puzzles 😉
David Allen / Allen
two / tur
ring / ring
break / breaks
question mark / enigma (this was easy after I got the rest)
security key code / code
Alan Turing breaks the Enigma code.
Later, he developed the so-called "Turing Test" for assessing artificial intelligence, thus providing me with an earlier Rebus puzzle subject. That enigmatic puzzle was eventually broken by @TasMike.