symmetric key

What is symmetric key?

symmetric key meaning in Internet terms is
Definition: A cryptographic key that is used to perform both the cryptographic operation and its inverse, for example to encrypt plaintext and decrypt ciphertext, or create a message authentication code and to verify the code.
Extended Definition: Also, a cryptographic algorithm that uses a single key (i.e., a secret key) for both encryption of plaintext and decryption of ciphertext.
Related Term(s): secret key
From: CNSSI 4009


reference: Glossary | National Initiative for Cybersecurity Careers and Studies