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PORTIA: Of a strange nature is the suit you follow;
Yet in such rule that the Venetian law
Cannot impugn you as you do proceed.
[To Antonio.] You stand within his danger, do you not?—The Merchant of Venice, IV, i, 177–180.
A security policy defines "secure" for a system or a set of systems. Security policies can be informal or highly mathematical in nature. After defining a security policy precisely, we expand on the nature of "trust" and its relationship to security policies. We also discuss different types of policy models.
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