code for ike in ipsec

主要介绍IPSec技术。IPSec（IP Security）是IETF制定的为保证在Internet上传送数据的安全保密性能的三层隧道加密协议。-mainly introduce IPSec technology. IP Security Is a IETF development of the security of the security performance of the three layer tunnel protocol to ensure the security of the