改进的AES算法在智慧住区门户中的应用与实现

智慧住区信息门户系统中包含着大量及涉及居民生命财产安全的敏感数据，为了保证这些数据的保密性，采用优化的AES加密算法对这些数据进行加密，在保证数据安全的同时，减少了加密时间，从而减少了通信延时，提高了系统的性能.分析了高级加密标准AES的原理和加解密流程，针对AES算法加解密过程耗时相差较大的问题，在列混合和逆列混合运算时采用有限域GF（2^8）上最简形式的矩阵，减少了解密过程的运算量，使加解密过程耗时差减少了.在此基础上对加解密过程进行了合并优化，在保证加密速度的同时，减少了算法所占用的存储空间.在Visual Studio 2010平台上，使用C语言实现了几种AES优化算法在智能家居中的应用，结果显示，所提的优化算法有较高的执行效率，并占较少的存储空间.

Application and Implementation of Improved AES Algorithm in Smart Residential Areas Web Portal

Smart residential areas information portal system contains a large number of sensitive data related to the residential life and property security. In order to ensure the confidentiality of the data, optimized AES encryption algorithm is used to encrypt the data to reduce the encryption time, thereby reducing the communication time delay, which improves the performance of the system a lot. The principle, as well as the flow of encryption and decryption of AES algorithm, is analyzed in the following sections. In order to overcome the problem that the time used in decryption is longer than in encryption, a simplest matrix in the Galois field GF(2^8) is going to be adopted in MixColumn and inverse MixColumn operation to reduce the computation and time consumption in decryption. And then based on this, the steps in encryption and decryption process is merged and optimized in some degree, reducing the storage space, at the same time it can keep the execution efficiency. In the Visual Studio 2010 platform, several optimized AES algorithms are implemented in intelligentHome by adopting C language. It shows that the proposed optimized algorithm has higher efficiency and occupies less storage space.