终于完成，
经过几天的研究，我找到了适合我的问题的解决方案.

Finally done,
after days of researches I found a suitable solution for my problem.

我决定使用证书机制.现在我正在创建一个证书，我可以使用消息安全性.

I decided to use a certificate mechanism. Now I am creating a certificate and I can use message security.

是的，开销很大，但效果很好.

Yes, it was quite an overhead, but it works fine.