[Loq]

Everybody lies about two things: money and sex!

I can't recall who said this to me as a teenager, but at the time it felt wrong! I had not yet much experience with either. Navigating the adult world changed that, but I didn't grow beyond a vague feeling of the need for caution in delicate human matters. It was only when I learned about crypography, security and distributed systems, that I understood the value, and indeed necessity, of having attacker models. I realised that the social world, too, has benign and adversarial parts (and many shades inbetween): for example you can trust your mathematics teachers nearly 100% when they talk about mathematics, but you should probably be prepared for being taken advantage off in financial transactions, whence the aphorism.