Cloud data storage is a service offered by cloud computing for storing the data. Though it has a lot of benefits, the security of the stored data is one of its major concerns. Many models have been developed to address this issue. These models encrypt the data and store them. Advanced encryption standard (AES) is one of the encryption methods that has been used prevalently. This paper presents a model that tries to further strengthen the AES algorithm. It alters the shift row of the AES by making it key dependent. The key dependency enhances the security of the algorithm and the results show that the statistical pattern of the plaintext is dispersed over the cipher text, thereby, defending the plaintext from the cryptanalysis. Experimental results indicate that the dispersion ratio of the plaintext over the cipher text increases from 0.75 for AES to approximately 1 for the proposed model. The model is also analyzed using the coefficient of variation metric. The proposed model also exhibits a significant level of avalanche effect.

云数据存储是云计算提供的用于存储数据的服务。尽管它有很多好处，但是存储数据的安全性是其主要关注之一。已经开发出许多模型来解决这个问题。这些模型加密数据并存储它们。高级加密标准（AES）是一种普遍使用的加密方法。本文提出了一个试图进一步加强AES算法的模型。它通过使其与密钥相关来更改AES的移位行。密钥依赖性增强了算法的安全性，结果表明明文的统计模式分散在密文上，从而保护了明文免受密码分析的侵害。实验结果表明，明文在密文上的分散比从0开始增加。AES为75，建议的模型为1。还使用变异系数度量分析模型。提出的模型还表现出显着水平的雪崩效应。