Concept of Operation for Handling I/O in a Secure Computer at the Air Force Data Services Center (AFDSC),

摘要

The operation of a computer system in a secure fashion requires the control of access to all parts of the system. One part of the system which is often neglected when access and security controls are developed is the input/output (I/O) subsystem. This paper develops a general Concept of Operations for I/O in a secure computer system. This concept is then applied to the proposed two-level,Secret-Top Secret, MULTICS System at the Air Force Data Services Center (AFDSC). The most unusual operational feature recommended for the AFDSC MULTICS is the use of autonomous processes to perform all I/O,preventing any user from directly accessing any I/O device. Procedures are described to provide the necessary controls for operation in the Data Services Center environment. (Author)