Bugging devices fall into four broad categories:

With the exception of the ACOUSTIC device all bugging devices rely on conveying speech to a remote location using some sort of 'carrier' i.e. ULTRASONIC, VLF, RF or OPTICAL.

An Acoustic device may be as simple as placing a glass tumbler against a party wall to establish what is going on next door, this may be surprisingly effective. Sound leaking through cavities or air conditioning ducts falls into this category.

An Ultrasonic or VLF device converts sound into an audio signal above the range of human hearing.

An RF (or Radio Frequency) device is the most commonly found form of bugging attack. Simple, cheap, easily concealed and deadly effective. Sound is carried away on an RF 'carrier' wave and may be transmitted, and hence received, some considerable distance and in any direction from the target.

An Optical-bugging device conveys sound (or data) away on an optical pulse or beam of light. Optical bugging devices are capable of transmitting large amounts of data but require direct 'line of sight' to the listening post (LP) and are susceptible to climatic conditions i.e. fog, rain, snow etc.

top

Technical Surveliance Countermeasures | Are You Being Bugged? | The Threat | The Counter | Bugging Devices | Radio Frequency Bugs
Spectral Profiling | Examples of Spectral Data Logging | RF Bugging Frequencies | Artemis Proceedures | Telephone Tapping & Bugging
Wire Tapping | The Law | TSCM Equipment | Physical Security | Data Security | Company Profile | KITSA: Key Individual Technical Security Audit