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A detailed account of ways to protect computer systems, especially remotely accessible online time-sharing systems, from invasions of privacy. Communication links cannot be physically secured (see RM-3765); the only broadly effective countermeasure against wiretapping methods is privacy transformations (secret codes), which may require additional hardware. Other countermeasures include once-only passwords; electromagnetic shielding to prevent radiation pickup; systematic verification of the integrity of hardware, software, and personnel; checking up on accidental interference and overlong computer session. Hardware breakdowns and the shielding of processors to prevent "tuning in" present unsolved problems. It appears possible to engineer information systems so that the cost of privacy protection is proportional to the amount desired. (Prepared for presentation at the Spring Joint Computer Conference, Atlantic City, April 1967.) 44 pp. Ref.
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