Wiktionary
n. The art of evading surveillance
Wikipedia
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.
Usage examples of "countersurveillance".
We learned different surveillance skills, countersurveillance skills, how to give as much information as possible on the net in the least number of words.
From now on they were going to assume that Tuohey had a full countersurveillance going.
If, on the other hand, it was Harrod or Komulakov, then the people who were shadowing him were likely countersurveillance or counterintelligence spooks-there to either protect Newman or finger him if he was disloyal.
There was a small but non-zero chance that whoever it was had picked up the countersurveillance and shut down their operation to avoid being busted.