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ELECTRONIC SURVEILLANCE AND COUNTERMEASURES

NCJ Number
44794
Journal
Assets Protection Volume: 2 Issue: 3 Dated: (FALL 1977) Pages: 12-22
Editor(s)
W J WARD
Date Published
1977
Length
11 pages
Annotation
THE STATE-OF-THE-ART OF ELECTRONIC SURVEILLANCE AND TECHNICAL SURVEILLANCE COUNTERMEASURES IS EXAMINED IN THIS ARTICLE FOCUSING ON AUDIO SECURITY COUNTERMEASURES.
Abstract
AUDIO COUNTERMEASURES, TECHNICAL SECURITY COUNTERMEASURES, AND 'DEBUGGING' ALL ARE TERMS USED TO DESCRIBE THE SCIENCE OF AUDIO SURVEILLANCE DEVICE DETECTION AND PENETRATION PREVENTION. THE STATUS OF AUDIO COUNTERMEASURES IS EXAMINED, AND THE TYPES OF EQUIPMENT AVAILABLE ARE DESCRIBED. THE APPLICATIONS AND LIMITATIONS OF EQUIPMENT ARE NOTED, AND AN ASSESSMENT IS MADE OF THE SUITABILITY OF VARIOUS DEVICES FOR DETECTION OF AND PROTECTION AGAINST ELECTRONIC INVASIONS OF PRIVACY. TWO TYPES OF TELEPHONE EAVESDROPPING ARE COVERED: THE USE OF ELECTRONIC DEVICES TO EAVEDROP ON TELEPHONE CONVERSATIONS; AND THE USE OF PART OF THE TELEPHONE SYSTEM TO EAVESDROP ON CONVERSATIONS IN A ROOM. COUNTERMEASURE EQUIPMENT AND PRACTICES DIRECTED AGAINST WIRE AND RADIO SYSTEMS OF TELEPHONE TAPPING AND AGAINST A NUMBER OF DIFFERENT TELEPHONE-BASED ROOM EAVESDROPPING SYSTEMS (INFINITY TRANSMITTERS, LISTEN-BACKS, KEEP-ALIVES, ON-LINE MICROPHONES, TELEPHONE MODIFICATION) ARE DESCRIBED. THE DISCUSSION OF EQUIPMENT AND METHODS FOR DETECTING RADIO EAVESDROPPING DEVICES COVERS FIELD-STRENGTH MEASUREMENT, COUNTERMEASURE RECEIVERS, SPECTRUM ANALYSIS, AND OTHER INSPECTION EQUIPMENT. ALSO DESCRIBED ARE SYSTEMS FOR NEGATING THE EFFECTIVENESS OF AN AUDIO SURVEILLANCE DEVICE ONCE ITS PRESENCE HAS BEEN DETECTED. INCLUDED ARE ACOUSTIC PROTECTION SYSTEMS (THE ROOM WITHIN A ROOM) AND RADIO FREQUENCY PROTECTION SYSTEMS. THE COUNTERMEASURE SWEEP, OR 'DEBUGGING,' SERVICE PROVIDED BY SECURITY INSPECTION ORGANIZATIONS IS ALSO DISCUSSED. TABLES SUMMARIZING THE CHARACTERISTICS OF COUNTERMEASURE DEVICES, INCLUDING COSTS AND SUPPLY SOURCES, ARE PROVIDED.

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