conventional cryptosystem
Technical term in computing for a cryptosystem that uses a single shared key for both encryption and decryption, as opposed to public-key systems.
In a conventional cryptosystem, the sender and receiver need to share the same key.
Public-key cryptography, which uses separate keys for encryption and decryption, unlike 慣用暗号システム which uses a single shared key.
Compound of 慣用 (conventional) + 暗号 (cipher) + システム (system). A direct translation of the English term 'conventional cryptosystem'.