子密钥生成算法的改进

Modified sub-key generating algorithm

本文主要研究字段一级的数据库加密的密钥问题。在简要介绍生成子密钥的字段加密技术后,分析和对比已有的数种子密钥生成算法,提出按位对应插入的子密钥生成算法。这种算法在安全性上比文中所提到的A5算法有所改进,并同时兼顾数据加密所要求的效率和安全性。

In this paper we study the problem of database encryption keys at the field level.First we introduce the field-based data encryption with sub-key generating（FBDE） technology,then we analyze and compare several currently available sub-key generation algorithms.After that,we present an insertion according to each bit of the corresponding sub-key generation algorithm.This approach is safer than the A5 algorithm in the article,and taking into account the efficiency and security of the required data encryption.