Signals intelligence (SIGINT) encompasses the various disciplines of wireless interception, cryptanalysis, communications intelligence, electronic intelligence, direction finding, and traffic analysis. It has become the basis upon which all combat operations are undertaken. It is now widely recognized as an absolutely vital dimension to modern warfare and was proven to be a vital component in the counterintelligence war between the West and Soviet bloc intelligence agencies.

Acknowledgments; Editor's Foreword; Acronyms and Abbreviations; Chronology; Introduction; A; B; C; D; E; F; G; H; I; J; K; L; M; N; O; P; Q; R; S; T; U; V; W; X; Y; Z; Appendix A. VENONA Glossary; Appendix B. Agreement between British Government Code and Cipher School and U.S. War Department in regard to Certain "Special Intelligence"; Appendix C. British-U.S. Communication Intelligence Agreement; Bibliography; Index; About the Author.