Play fair algorithm

Playfair cipher is an interesting data encryption technique with a medium level of complexity, and therefore, issuitable for security of wireless and mobile systems. Different sizes of the matrices used for key have been previously studied by researchers, but no study has been done so far that provides a comparative analysis of different matrix sizes of a key. This paper is motivated by this observation, and provides a comparison of three different matrix sizes used for the key. These matrices are 9 x9, 10 x 10, and 11 x 11.Different experiments were performed which indicate that for the data used herein, the size of the plain-text does not have a significant
effect on the encryption of the output. However, the size of the key does have a
notable effect and the encryption level increases with big keys of bigger sizes

波菲尔密码是一种颇具趣味的中等复杂度的数据加密技术，因此，它适用于无线和移动系统的安全保障。研究者们先前已对用于密钥的矩阵的不同尺寸进行了研究，但迄今为止，尚无研究对密钥不同矩阵尺寸进行过比较分析。本文正是基于这一观察而撰写，旨在对三种不同尺寸的密钥矩阵进行比较。这些矩阵的尺寸分别为9x9、10x10和11x11。进行了不同的实验，结果表明，对于本研究所使用的数据，明文的大小对输出加密的显著影响并不大。然而，密钥的大小却具有显著影响，且随着密钥尺寸的增大，加密级别也随之提升。