非对称算法使用不同的密钥对消息进行加密或解密；其中一个秘钥必须是秘密的，而另一个密钥通常是公开的。
An asymmetric algorithm USES a different key for encrypting or decrypting the message; one of the keys must be kept secret, and the other key is usually made public.
数据块使用一个对称密钥算法进行加密，它使用一个密钥来实现对数据的加密和解密。
The bulk of the data is encrypted using a symmetric key algorithm that encrypts and decrypts data using a single secure key.
用于数据加密的密钥是使用带有与服务提供者（Service Provider）的 X.509 证书相关联的公钥的非对称算法进行加密的。
The key used for the data encryption is encrypted itself using an asymmetric algorithm with the public key associated with the Service Provider's X.509 certificate.
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