Patent · US Expired

Data protection for computer systems

US4962533A · kind A · utility

89Cited by

1References

4Claims

0Family size

Assignee

TEXAS INSTRUMENTS INCORPORATED · US

Inventors

Steven D. Krueger · Austin, US
Martha A. Branstad · Gaithersburg, US
Stephen T. Walker · Bethesda, US

Key dates

Filing date	Feb 17, 1989
Grant date	Oct 9, 1990
Priority date	—
Expiry date	Feb 17, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG06F21/79
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A computer system uses security labels for evey word in memory. Each access to a memory location requires that the security level of the memory location be compared to that of a process which is making the access. If the security level of the process does not dominate that of the memory location, access is denied. Each time a memory location is modified, it is assigned a security level consistent with the levels of all of the data which was used to modify the memory location.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.