"First of all, security does not come for free. If you want security, you'll have to pay the price. If you can't afford it, then you won't get good security"
#schneier #nielsferguson #cryptography

I often think of this in terms of operations research. It's fundamental in that field that constraints added to a system reduce the output of the system. Security is a constraint.

What's less obvious is the second order effect. Increased security increases confidence in a system, which can increase throughput through a psychological effect.