Evolution and security

Bruce Schneier also takes note of the film showing an octopus camoflaging itself and "walking" away on two of its tentacles.

I have a fondness for security countermeasures in the natural world. As people, we try to figure out the most effective countermeasure for a given attack. Evolution works differently. A species tries different countermeasures at random, and stops at the first one that just barely works.

Nitpick: Evolution stops at the first one that at least just barely works. If a randomly attempted countermeasure is spectacularly successful, evolution will stop with it; it won't discard it and continue looking for one that only "just barely works".