One disadvantage of asymmetric keys is that they take much longer to encrypt a message than do symmetric keys, and the encryption time is directly proportional to the size of the message.
非对称密钥的一个缺点是加密消息要比对称密钥花费更长的时间，而且加密时间直接与消息的长短成正比。
2
To my knowledge, these APIs allow applications that require an asymmetric cluster to be deployed on a J2EE server for the first time.
就我所知，这些API第一次允许将需要非对称集群的应用程序部署到J2EE服务器上。
3
When you're signing a large number of small messages with asymmetric encryption, most of your processing time is spent on the signature step.