下列关于IPSec的说法中，错误的是（ ）。
- A.IPSec用于增强IP网络的安全性，有传输模式和隧道模式两种模式
- B.认证头AH提供数据完整性认证、数据源认证和数据机密性服务
- C.在传输模式中，认证头仅对IP报文的数据部分进行了重新封装
- D.在隧道模式中，认证头对含原IP头在内的所有字段都进行了封装
正确答案及解析
正确答案
解析
认证头协议AH不能加密，只对数据报进行验证、保证报文的完整性。AH采用了安全哈希算法（MD5和SHA1实现），防止黑客截断数据包或者在网络中插入伪造的数据包，也能防止抵赖。
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