NCJ Number
13094
Journal
Law and Order Volume: 22 Issue: 2 Dated: (FEBRUARY 1974) Pages: 26,28-30
Date Published
1974
Length
4 pages
Annotation
COMMUNICATIONS INSTRUMENT OFFERING SECURITY AGAINST EAVESDROPPING WHICH CAN BE USED WITH ANY EXISTING RADIO-TELEPHONE.
Abstract
A REVIEW IS GIVEN OF THE NEEDS OF THE POLICE FOR SPEECH SCRAMBLING IN THEIR RADIO COMMUNICATION NETWORKS. DESCRIPITIONS ARE GIVEN OF DIFFERENT METHODS OF SPEECH SCRAMBLING. THIS SYSTEM BREAKS THE MESSAGE TO BE CODED INTO DISCRETE SEGMENTS SMALL EOUGH TO PREVENT THE EXTRACTION OF ANY SYLLABIC INFORMATION. THE SEGMENTS ARE STORED IN A MEMORY FOR DIFFERENT LENGHTHS OF TIME AND TRANSPOSED IN SUCH A WAY THAT THE RESULTING SEQUENCE NO LONGER REPRESENTS A COMPREHENSIBLE LANGUAGE. THE MESSAGE IS THEN APPLIED TO THE TRANSMITTER IN THIS UNRECOGNIZABLE FORM AND TRANSMITTED. (AUTHOR ABSTRACT MODIFIED)