分组加密算法DES与AES的对比研究

随着计算机的广泛应用和信息产业的快速发展，信息的安全越来越被重视。信息安全主要由安全歇息和加密算法构成，而加密算法是信息安全的基础和核心技术。因此研究分析目前主流的加密算法对我国的信息安全有重要意义。DES和AES高级加密算法作为新一代美国数据加密方法的标准也实际成为了国际标准，并且算法免费且公开，因此以此算法位基础的加密产品将会得到更加广泛的应用。
本文先分别介绍了两者算法的设计原则、设计原理，详细地描述了该算法的总体构成，分析算法的优势和不足。然后分析DES与AES算法的安全特性对比。
通过详解两种算法的内部构造，分析了两者实现加密的原理以及难以被攻破的原因，指出了两者共同的特点和各自特别之处。
DES算法除了密钥短容易被穷举攻击之外，目前还没有别的方法能造成威胁，然而在实际应用中对加密方法要求万无一失，AES于是从众多备选方法中挑选出来。它继承了前者的巧妙设计思想，但与前者之间也有不同之处，S盒设计更巧妙、密钥的长度更加灵活，抵抗攻击的能力也大大提升。

关键词：AES，加密算法，信息安全
ABSTRACT

With the extensive application of computer and information industry, the rapid development of information security more and more attention. Mainly by the rest of information security and encryption algorithms constitute a security, information security and encryption algorithm is the foundation and core technology. Therefore, analysis of the encryption algorithm to the current mainstream of information security in China is important. DES and AES encryption algorithm as a new generation of high-level U.S. data encryption standard has actually become the international standard, and the algorithm is free and open, so this algorithm is bit-based encryption products will be more widely used.
    This article first introduced the design principles of the two algorithms, design principles, a detailed description of the overall composition of the algorithm to analyze advantages and disadvantages of the algorithm. DES and the AES algorithm and then analyze the security features of contrast.
Through the internal structure of the two algorithms Detailed analysis of the two principles of encryption and the difficulty of achieving compromised the cause that the common features between the two and their respective special.
In addition to the key short-DES algorithm is likely to be other than brute-force attack, there is no other way to pose a threat, but in the practical application of the method requires foolproof encryption, AES so many options to choose from it. It inherits the former's clever design, but there are differences between the former place, S box design is more subtle, more flexible key length, resistance is also greatly enhanced the ability to attack.
 

Key  Words：AES，Encryption algorithm，Information security

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