One advantage of WS-SecureConversation is supposed to be a performance gain from using symmetric encryption rather than asymmetric encryption.
The Rampart distribution includes a separate module called rahas, which enables issuing security tokens required by WS-SecureConversation.
This approach offers good performance for message exchanges - nearly as good as WS-SecureConversation - when the messages are relatively large.
The performance advantage is much less pronounced in the case of larger messages, but WS-SecureConversation is still a respectable 18 percent faster in that case.
当消息相对较大时，这个方法在实现消息交换时有很好的*能—几乎与WS-SecureConversation一样好。
