So How Many Bits Does The Prime Number Have?

“Education isn’t something you can finish.” — Isaac Asimov (1920–1992)

Recently, we had an interview with someone who was applying for a PhD studentship. The candidate had an MSc in Cybersecurity (from another university, I should say), and so as a little icebreaker, we said, “Do you know public key encryption?”, “Oh, yes”, “And do you know…