A secret key for symmetric encryption that is generated for use for a short period of time is called A session key is an encryption and decryption key that is randomly generated to ensure the security of a communications session between a user and another computer or between two computers.
Session keys are sometimes called symmetric keys because the same key is used for both encryption and decryption.
Secret-key cryptography is also called symmetric cryptography because the same key is used to both encrypt and decrypt the data.
There are two types of encryption in widespread use today: symmetric and asymmetric encryption. The name derives from whether or not the same key is used for encryption and decryption.
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