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构造了基于分组密码结构的加密认证码，并证明了它的安全性完全依赖于分组密码的安全性．对一类简易的迭代加密认证码，证明了其一阶安全性．
An encrypted authentication code based on block cipher structure is constructed and its security is proved to be completely dependent on the security of block cipher. A kind of simple iterative encryption authentication code proves its first order security.