Dealing with GSM eavesdropping threats

Written by: Barry Stephen, August 09, 2015 13:41

One of the primary design goals of our latest counter surveillance development was to minimise false alarm rates, these are traditionally caused by the large and varied number of radio signals present in the modern office environment.
Our main challenge related to the proliferation of GSM mobile phone signals coupled with the fact that benign mobile handsets and malicious mobile handsets / GSM bugging devices could not be reliably differentiated.
Based on a patent applied for technique, we have now developed our system so that it can accurately and robustly identify illicit GSM mobile signals within the confines of a modern boardroom, meeting room or office.
This detection capability is greatly enhanced by the fact that the system will also effectively ignore GSM signals which are out with the immediate office / room being protected.

Unlike previous systems, that relied purely on received signal strength indication (RSSI), our technique combines both radio and acoustic signal processing algorithms to determine whether the GSM mobile handset /  bugging device is a viable eavesdropping threat.

The resultant e-Shield Personal system has recently been trialled in the harshest of radio environments (shared office complexes in central London) with very encouraging results.
By utilising e-Shield Personal illicit GSM phone use / GSM bugs can now be reliably detected within an office whilst a legitimate call can still be made immediately outside the protected area (corridor or adjacent office) without causing false alarms.