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There are three parts of the Java Security model:
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Byte Code Verifier: checks that the downloaded .class files obey the rules of the Java Virtual Machine
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Class Loader: makes certain that Java classes have a security structure that prevents outside applets contaminating built in runtime.
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Security Manager: implements overall policy which depends on particular browser and includes privileges open to applets and processing of authentication mechanisms
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Note first two parts can have bugs; last part can have both bugs and ill advised policies!
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