对称算法要求消息的发送方和接收方使用同一个秘钥；这通常被称作秘钥密码术。
A symmetric algorithm requires that both the sender and receiver of the message use the same secret key; this is often referred to as secret key cryptography.
有些应用试图把明钥和秘钥密码术结合起来，以获得安全性和高性能。
Some applications try to combine public - and secret-key cryptography to achieve security and performance.
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。
The two main competing cryptography schemes are known as the secret-key (symmetric) system and the public-key (asymmetric) system.
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