update

 ## 安全控制
 
 ### 消息完整性校验
-![checksum](http://img10.static.yhbimg.com/goodsimg/2015/09/15/08/01391f6bef99e5d032a9e91f865bfede6d.jpg?imageMogr2/thumbnail/420x560/extent/420x560/background/d2hpdGU=/position/center/quality/80)
+![checksum](http://7xs795.com1.z0.glb.clouddn.com/228694685069003367.jpg)
 
 ### 会话控制
- ![228694685069003367](http://git.dev.yoho.cn/uploads/yoho-documents/api-interfaces/03b79cb657/228694685069003367.jpg)
+ ![session](http://7xs795.com1.z0.glb.clouddn.com/10270172634654153.jpg)