自己做的讲座PPT 密码学与协议学，主要涉及较前沿的领域 包括有复合加密，公钥密码学，密钥的建立，身份认证等-PPT lectures own password to do with the study protocol study, mainly related to the more cutting-edge fields, including the compound there is encryption, public key cryptography, key establishment, authentication, etc.