Abstract
When the individuals concerned are members of an organization, however, that organization may circumscribe their discretionary power to grant access to information by imposing a mandatory security policy to safeguard the interests of the organization as a whole. The most widely used scheme of this type is the multilevel security, or MLS, policy employed in military and government environments[1]. Here, each individual is assigned a clearance chosen from the four hierarchically ordered levels, Unclassified, Confidential, Secret, and Top Secret, and each item of information is assigned a classification chosen from the same four levels. The fundamental requirement is that no individual should see information classified above his clearance.
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