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Abstract: : Consideration is given to several problems encountered in the design of a secure, multilevel Data Base Management System (DBMS). The DBMS will operate within the environment of a certified, secure operating system which will implement and enforce the Department of Defense Information Security Program for protection of classified information. A set of DBMS security requirements is used as basis for design considerations, and the economic and functional impact of these requirements is assessed. Areas of consideration include: data organization and structure, operations on structured data, coordinated data sharing and data entry. On the basis of these considerations, it is concluded that relational data systems minimize the impact of the DBMS security requirements on the functional capabilities of a DBMS. These same requirements are found, however, to increase the costs of coordinated data sharing, and to present difficult problems in multilevel data entry.

Abstract: Data encryption and related methods may be used to preserve information security i n a data network. Here information security is defined as the degree to which the destruction, change or loss of i ...

Abstract: Modifications increasing the cryptanalysis resitance of the National Bureau of Standards developed Federal Data Encryption Standard are discussed.