I like this essay because it nicely illustrates the security mindset.

It was written in 1971, but this still seems like a cool book:

For an elementary illustration of tactics, take parts of your face as the point of reference; your eyes, your ears, and your nose. First the eyes: if you have organized a vast, mass-based people's organization, you can parade it visibly before the enemy and openly show your power. Second the ears; if your organization is small in numbers, then do what Gideon did: conceal the members in the dark but raise a din and clamor that will make the listener believe that your organization numbers many more than it does. Third, the nose; if your organization is too tiny even for noise, stink up the place.

Always remember the first rule of power tactics: Power is not only what you have but what the enemy thinks you have.

The second rule is: Never go outside the experience of your people. When an action or tactic is outside the experience of the people, the result is confusion, fear, and retreat. It also means a collapse of communication, as we have notes.

The third rule is: Wherever possible go outside the experience of the enemy. Here you want to cause confusion, fear, and retreat.

The fourth rule is: Make the enemy live up to their own book of rules. You can kill them with this, for they can no more obey their own rules than the Christian church can live up to Christianity.

The fourth rule carries within in the fifth rule: Ridicule is man's most potent weapon. It is almost impossible to counterattack ridicule. Also it infuriates the opposition, who then react to your advantage.

The sixth rule is: A good tactic is one that your people enjoy. If your people are not having a ball doing it, there is something very wrong with the tactic.

The seventh rule: A tactic that drags on too long becomes a drag.

[...]

The twelfth rule: The price of a successful attack is a constructive alternative. You cannot risk being trapped by the enemy in his sudden agreement with your demand and saying "You're right--we don't know what to do about this issue. Now you tell us."

The thirteenth rule: Pick the target, freeze it, personalize it, and polarize it.

Need some pre-industrial security for your USB drive? How about a wax seal? Neat, but I recommend combining it with encryption for even more security!