The Poor Man's Countersurveillance Toolkit: Nonlinear Junction Detector

Presented at ToorCon San Diego 17 (2015), Oct. 25, 2015, 11 a.m. (20 minutes)

In this talk we investigate the use of general purpose software defined radios (SDRs) to implement technical surveillance countermeasure devices such as nonlinear junction detectors and microwave sweep generators. Typically TSCM equipment is extremely expensive and are the purview of well funded counter surveillance teams only. Using a cheap software defined radio, as well as commonly available microwave devices such as filters, amplifiers and custom aerials, it is possible to produce useful diagnostic instruments for the detection of covert electronic devices.


  • Ryan Gibson
    Ryan is a security consultant with NCC group NA.

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