Kerberos is a network authentication protocol originally developed by MIT that provides mutual authentication using symmetric keys.
Kerberos是一种网络认证协议，最初由MIT开发，使用对称密匙实现相互认证。
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SSL protocol USES symmetric encryption, asymmetric encryption, message digest, digital signature, digital certificate and other cryptographic techniques.
SSL协议采用了对称加密、非对称加密、信息摘要、数字签名、数字证书等密码学技术。
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EKE is a kind of key exchange protocol based on week password and can resist offline dictionary attacks by use of symmetric key encryption and public key encryption.