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COMPUTER VIRUSES - PREVENTION, DETECTION, AND TREATMENT C1 Technical Report 001 Library No.: S232,522 6 June 1989 PREVENTION, DETECTION, AND TREATMENT by Mario Tinto This publication & 8230; & 8230; contains technical observations, opinions, and evidence prepared for informal exchange among individuals involved with computer security. The information contained herein represents the views of the author and is not to be construed as representing an official position of the National Computer Security left. Reviewed by: _____ & 8230;

II. Treatment and Prevention As with their biological namesakes, computer viruses come in a variety of types; their missions can be modification or theft of data, or denial of service. Their methods of attack will be as numerous and varied as the weaknesses manifest in systems. Thus, perfect and universal solutions are not likely; there will be no single solution developed capable of preventing any and all virus attacks. Such a solution is certainly not currently available. However, that is not to say that we are powerless to combat viruses, contain their effects, or limit their capability to do damage. The defenses against viruses are both technical and procedural. More specifically, the principles and mechanisms provided in the TCSEC, especially at class B2 and above, provide a variety of valid defenses against a large class of malicious code and, when applied effectively, can severely limit both the scope of the attack and the extent of the damage. A. Technical Measures 1. Trusted Computing Base The TCSEC has, as a central theme, the extremely strong notion of a Trusted Computing Base, or TCB (i.e., the implementation of the Reference Monitor concept). In essence, the TCB is the central policy enforcement mechanism for the computer system,

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