Subject vs. User vs. Principal in a Security Context

When an application uses JAAS authentication to authenticate the user (or other entity such as a service), a Subject is created as a result. The purpose of the Subject is to represent the authenticated user. A Subject is comprised of a set of Principals, where each Principal represents an identity for that user. For example, a Subject could have a name Principal ("Susan Smith") and a Social Security Number Principal ("987-65-4321"), thereby distinguishing this Subject from other Subjects.

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