Definitions

Definition 1

A formal security model designed by McLean to demonstrate a limitation of the Bell-LaPadula Model in the may it manages state transitions and more generally the limitations of formal security models that are based on a universal or platonic definition of security.

In System Z, when a subject s requests any access to an object o, the security clearance of every subject is downgraded and the security classification of every object is downgraded to the lowest level. Obviously , the resulting system is intuitively insecure but yet, it is formally secure under BLP definitions.

Related Terms

Quotes

Bibliography

• Anderson, 2008

• Bell, 1988

• McLean, 1987

See Also