中文摘要：

在大数据环境下数据的安全比传统的数据安全更加复杂，通常芽取数据加密技术对大数据进行加密，以保证其安全性。介绍了一种特殊的混合密码体制，适用于从一维数组中提取小于（或者大于）某一关键字的数据域，进而对这部分数据进行加密。

英文摘要：

In the environment of the big data, data＇s safety is more complicated than the traditional security. People usually take the data encryption technology to encrypt big data, in order to ensure its safety. In this paper I introduce a special hybrid cryptosystem. It is suitable for extracting the data domain from an one - dimensional array, whose numerical value is less than （or more than） a keyword. Then people encrypt this part of data. To an extent, this method helps to improve the speed ofencrypfing big data.