Access Control (or Authorization)
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Assurance that the person or computer at the other end of the session is permitted to do what he asks for.
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Authentication
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Assurance that the resource (human or machine) at the other end of the session is what it claims to be
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Integrity
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Assurance that the information that arrives is the same as when it was sent
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Accountability (or non-repudiation)
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Assurance that any transaction that takes place can subsequently proved to have taken place
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Privacy
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Assurance that sensitive information is not visible to an eavesdropper (usually achieved using encryption)
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