We employ cryptography to achieve four main goals: confidentiality, integrity, authentication, and non-repudiation.
Confidentiality is the assurance that only the intended recipient can read the contents of the message. Integrity ensures that the message cannot be changed between the source and the destination. Authentication validates the identity of the sender of any information. Non-repudiation is closely tied to authentication and integrity, in that it establishes that the authenticated person is the only person that could have sent the message and that the message is, in fact, what the sender originally sent.
Confidentiality, integrity, and authentication can be implemented . . .
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