介绍基于对称密码系统的可证明安全理论，利用平方哈希函数实现技术，对一种可证明安全算法DFC实施改进后，安全性没有损失，但是速度得到了提高。
In this paper, based on provable security theory, a provable security cipher DFC is improved on speed without lost of security by means of fast implementation of square hash function.
在标准模型下可证明它的安全性，并且阐述其高效性。
It could be proven secure in the standard model, and it was efficient.
在标准模型下可证明它的安全性，并且阐述其高效性。
It could be proven secure in the standard model, and it was efficient.
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