Four different identity authentication mechanisms are introduced in the IKE main mode while it is designed to protect the private identity, include the preshared key, the digital signature and two public key encryptions.

• 在IKE协议主模式中进行身份保护的同时引入了四种不同的身份认证机制。 基于预共享密钥的认证机制、基于数字签名的认证机制以及两种公钥加密认证机制。