Accession Number : AD0778658

Title :   Context Protection and Consistent Control in Data Base Systems. Part I.,

Corporate Author : OHIO STATE UNIV COLUMBUS COMPUTER AND INFORMATION SCIENCE RESEARCH CENTER

Personal Author(s) : Hsiao, D. K. ; Kerr, D. S. ; Nee, C. J.

Report Date : FEB 1974

Pagination or Media Count : 32

Abstract : Although the capability of the access control mechanisms to regulate field, record, and file security has been recognized as indispensible in advanced data secure systems, there is the need of more subtle protection and refined control which the authors shall call context protection and consistent control. Context protection enables the same data unit (field, record or file) to be protected differently in different contexts. For example, the same data field may be protected differently in different records. The difference may be determined by the manner in which the fields and records are being accessed. Consistent control is concerned with the problem that when new data units based on the old data units of the data base are created by the user, these data units must be protected consistently in the sense that their access attributes must be generated automatically and must conform with the access attributes of the old data units. This report presents the authors' first finding in context protection. No discussion on consistent control is included here. A graph-theoretic approach is used. (Modified author abstract)

Descriptors :   *DATA BASES, PROTECTION, ACCESS, CONTROL, GRAPHICS, MATHEMATICAL LOGIC.

Subject Categories : Theoretical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE