Basic Information
A security device is exactly what it might be supposed to be - a device that provides security. This, of course, covers quite a wide range of functions.
The most passive end of the spectrum probably lies amongst locks and similar closures - bolts, bars, knots and the like. These simply hold an opening shut (or occasionally open) until bypassed. The actual barriers themselves (such as doors and gates) are not generally considered "devices". These devices - especially in fantasy literature - can end up being extremely complex, requiring puzzles on an architectural scale or the activation of multiple switches distributed across a wide area. Physical separation, coupled with a requirement for simultaneous use, can require the co-operation of multiple individuals to open a lock, whilst various forms of validation - from the knowledge of a personal knot, to a DNA or retinal scan - can control who can operate it. The physical key is a common compromise, as are combinations or other pass-phrases that can be entered into the mechanism of the lock.
Semi-active security devices - sometimes called traps - can be fitted to an opening, object or location to respond to unauthorised use. The results of tripping such a device can vary - some merely make a passive device more secure (such a a time-lock function responding to a false combination), whilst others will raise an alarm or even inflict direct or indirect harm on a would be thief or intruder. These would probably include more advanced devices such as sentry-guns.
Fully active devices remain largely conjectural but would seem to consist of anything that substitutes for a human guard - typically a robot. Arguably some of the less immediately credible monsters from "that-rpg" may count - all those that seem to exist solely to kill people looking for treasure may have actually been created for that purpose. (In meta terms biothaumaturgical bioroids used as security devices).
Sources
Game and Story Use
- These are a big part of old school fRPGs (where they are more generally known as traps - although some of the more "specialised" monsters might also count as above), whether strewn randomly around the dungeon or protecting the treasure chest.
- Pulp also likes its traps - any Indiana Jones media will generally include at least one trap gauntlet, and may be considered typical of any pulp in which ancient ruins appear.
- They are also a big part of modern games - usually in the form of alarms needing to be stealthily bypassed. More lethal systems start to accumulate as the level of dystopia increases.