IN ADDITION TO PRESENTING THE STANDARD METHODS, IT INCLUDES A DISCUSSION OF MACHINE ARCHITECTURE AND ITS INFLUENCE ON SECURITY; AN OVERVIEW OF THEORETICAL MODELS OF SECURITY; A COMPLETE DESCRIPTION OF THE NEW FEDERAL STANDARD FOR CODE ENCIPHERMENT; SOME NEW METHODS FOR ENCIPHERING RANDOM-ACCESS FILES; A CHAPTER ON PREVENTING MISUSE OF DATA IN 'STATISTICAL' FILES; AND A DISCUSSION OF LEGISLATIVE TRENDS IN PRIVACY AND THEIR RAMIFICATIONS FOR SYSTEMS DESIGN. IN ADDITION, A COMPREHENSIVE REFERENCE LIST IS PROVIDED FOR THE READER WHO WISHES TO PURSUE CERTAIN AREAS IN MORE DETAIL. QUESTIONS FOR SELF-STUDY OR CLASS USE FOLLOW EACH CHAPTER. (AUTHOR ABSTRACT)...MSP