基于安全策略的动态加密技术研究

摘要

对数据进行加密是一种保证数据安全性的有效措施，但现有的数据加密方式一般是选定某种加密算法，用该加密算法对数据进行全文加密。而不同终端设备的性能存在很大差异，移动终端设备如智能手机受其体积限制，计算能力和能源供给都十分有限，难以承受全文加密的计算量和能源开销。因此提出了一种动态选择加密方法，动态的选择加密算法对部分数据进行加密，并在该方法的基础上提出了基于安全策略的数据加密传输方案。在保证较高安全强度前提下，降低了加密开销提高了加密效率。%Data encryption is an effective measure to ensure the data security. However, the traditional way is to choose an encryption algorithm, then using this algorithm to encrypt the whole data. There is a big difference in performance of different terminal devices. Mobile devices such as smart phone due to size restrictions, computing power and energy supply is very limited, cannot afford the full encryption computation and energy overhead. Therefore, this paper presents a dynamic selective encryption method. Dynamically select encryption algorithm to encrypt part of the data. And proposed a data encryption transmission scheme based on security policy on the basis of the method. Both to ensure a high security strength, while reducing the encryption overhead and improves the encryption efficiency.