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The primary goal of cryptography is to provide a means for communicating confidentially and with integrity over a public channel. In practice, this goal is often achieved with key exchange protocols which allow the parties communicating over an insecure network to establish a common secret key called a session key. Typically, the communicating parties, who want confidentiality and integrity, first generate a session key by running an appropriate key exchange protocol and then use this key together with standard cryptographic algorithms for message encryption and authentication.
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