| (I) In the context of symmetric encryption, a key that is
temporary or is used for a relatively short period of time. (See:
ephemeral key, key distribution center, master key.)
(C) Usually, a session key is used for a defined period of
communication between two computers, such as for the duration of a
single connection or transaction set, or the key is used in an
application that protects relatively large amounts of data and,
therefore, needs to be rekeyed frequently.
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