A group of neuroscientists and cryptographers have developed a password system that does just that. The system relies on implicit learning, a process by which you absorb new information but you’re unaware that youve actually learnt anything. The process of learning the password involves the use of a specially crafted computer game that, funnily enough, resembles Guitar Hero. It also gives you deniability: If a judge or policeman orders you to hand over your password, you can plausibly say that you dont actually know it.””]