Secret-key encryption is also known as.

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Secret-key encryption uses the same secret key for both encryption and decryption. That shared-key approach is what gives it the name symmetric encryption—the key is the same in both directions. Some sources also call it private-key encryption because the key must remain private between the parties. The term secret-encryption isn’t a standard label, and asymmetric encryption refers to a different approach that uses a public key for encryption and a separate private key for decryption. So the widely accepted term is symmetric encryption (also known as private-key encryption), with symmetric being the most common usage today.