ESP can accomplish data confidentiality and limited traffic flow confidentiality by applying cryptogram algorithm to encrypt all the data and padding. Besides, it can also provide the functions above mentioned that the AH owned.

• ESP协议通过使用密码算法对IP数据报的全部数据和填充的内容进行全加密,来实现数据保密和有限的数据流保密,还可以提供与AH协议相同的认证等服务;