The idea to stamp the birth certificate of everyone who dies would foil any attempt to use them to fraudently obtain a passport.

After the four youths foil an attempt at a second heist, they join forces.

Superman foils his attempt in stealing the device.

It also forces the attacker to tailor the exploitation attempt to the individual system, which foils the attempts of internet worms.

He sealed the hare inside a ceramic hare-shaped casket (both to protect the prize from the soil, and foil any attempts to locate the treasure with a metal detector).