Alice Goes In Search of the Prize

Alice goes to Bob’s house, but the door entry system asks for a password. She looks around, and smiles, and presses a few keys, and is able to get in … how did she do it?

Here is a clue:

She enters the hall and observes a painting:



Prof Bill Buchanan OBE FRSE

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.