Definitions for

**"Symmetric Algorithm"**An algorithm in which the key used for encryption is identical to the key used for decryption. DES is the best-known symmetric encryption algorithm.

A cryptographic algorithm that typically uses a single key, often referred to as a session key, for encryption and decryption. Symmetric algorithms can be divided into two categories, stream algorithms and block algorithms (also called stream and block ciphers).

Crypto algorithm that uses the same crypto key for encrypting and decrypting. Also called a " secret key" algorithm.