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: https://asecuritysite.com/ctf/ctf_bird

She enters the hall and observes a painting:

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Prof Bill Buchanan OBE

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