Submitted by “Running on almost twenty different architectures, and easily portable to others, NetBSD gained its reputation as the most portable operating system on the planet. While that may indicate high quality code, the ever demanding networked world cares about more than that. Over the past year, NetBSD evolved quite a bit in various areas. This paper will focus on those aspects relating to security.”
This is interesting even if you’re not interested in NetBSD specifically as it discusses and explains a lot of different techniques.
I’ve been reading a bit about security recently and this was very informative.