Countersurveillance
（重定向自Counter surveillance）
Countersurveillance refers to measures undertaken to prevent surveillance, including covert surveillance. Countersurveillance may include electronic methods such as bug sweeping, the process of detecting surveillance devices, including covert listening devices, visual surveillance devices as well as Countersurveillance software to thwart unwanted attempts by cyber crooks to access computing and mobile devices for various nefarious reasons (e.g. theft of financial, personal or corporate data). More often than not, countersurveillance will employ a set of actions (countermeasures) that, when followed, reduce the risk of surveillance. Countersurveillance should not be confused with sousveillance (inverse surveillance) as the latter does not necessarily aim to prevent or reduce surveillance.