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The symmetric key that can be used to protect the confidentiality of a single connection is known as the ______ key.
One time
Secret
Session
KEK
A session key is a single-use symmetric key used for encrypting all messages in one communication session. The KEK is a key used to unlock self-encrypting drives, and the other two answers are distractors.
Ref: https://tools.ietf.org/html/rfc4880
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