签发服务器是CA 的核心部分，具体实现加密与签名功能。
Signature Server realizes the function of encryption and digital signature as the core part of CA.
通过组合加密和签名，既保证了加密与签名的可靠性，又保证了系统的运行速度和存储空间要求。
With the help of hybrid encryption and signature, not only the reliability of encryption and signature is ensured, but also are the system's needs for running speed and storing space met.
其中MR型有向签名方案不但可以用于数字签名，而且可以用于数据加密，是一种新的加密与签名混合型方案。
In these schemes, MR type directed signature schemes are a new kind of mixed schemes for encryption and signature.
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