The two main competing cryptography schemes are known as the secret-key (symmetric) system and the public-key (asymmetric) system.
现有两种主要的、相互竞争着的密码术，被称作秘钥（即对称）系统和明钥（即不对称）系统。
The two main competing cryptography schemes are known as the secret-key (symmetric) system and the public-key (asymmetric) system.
现有两种主要的、相互竞争着的密码术，被称作秘钥（即对称）系统和明钥（即不对称）系统。
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