Session key

A session key is a single-use symmetric key used for encrypting all messages in one communication session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or multicast key which refers to any key used to encrypt messages, as opposed to other uses, like encrypting other keys (key encryption key (KEK) or key wrapping key). A session key is a single-use symmetric key used for encrypting all messages in one communication session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or multicast key which refers to any key used to encrypt messages, as opposed to other uses, like encrypting other keys (key encryption key (KEK) or key wrapping key).