公开钥密码系统或非对称密码系统是实现和保障信息安全的一种重要方式。
The public key cryptosystem or the asymmetric cryptosystem is an important way to implement and ensure information security.
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.
将对称密码算法和非对称密码算法共同使用，增强了应用系统的安全性。
Using the symmetric algorithms and the asymmetric algorithms together security performance of the application system is improved.
将第四章提出的基于对称密码的动态口令认证方案应用于统一认证系统中，构建了一个统一认证系统模型。
Through appling the password authentication scheme which is proposed in the fourth chapter to unification authentication system, we get a model of unification authentication system.
目前有几种加密技术如对称密钥密码系统和非对称密钥密码系统。
Several technologies exist for encryption, such as symmetric key cryptography and asymmetric key cryptography.
现有两种主要的、相互竞争着的密码术，被称作秘钥（即对称）系统和明钥（即不对称）系统。
The two main competing cryptography schemes are known as the secret-key (symmetric) system and the public-key (asymmetric) system.
分别对两种对称混沌密码系统进行了密码分析。
Cryptanalysis of two different kinds of symmetric chaotic cryptosystems is presented.
分别对两种对称混沌密码系统进行了密码分析。
Cryptanalysis of two different kinds of symmetric chaotic cryptosystems is presented.
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