【摘要】 为了提高数据库的安全,防止越过权限控制的信息泄露,利用数据项这一最小粒度作为加密单元,以增强数据库安全。分析了目前数据库中加密数据的方案。提出一种基于平均差值排序的密态数据库检索方法,以隐藏明文序列防止动态追踪。对字段级加密,通过引入干扰因子来隐藏信息的泄露。对可能出现的有限值域信息泄露进行了研究。对文献[5]提出的防泄露算法进行了分析。实验结果表明:改进的方法在增强数据安全的同时,也具有较短的响应时间。更多还原

【Abstract】 In order to improve database security,and to avoid information exposing of access control strategy,data item was used as the encrypted principle,applying its property of basic granularity to strengthen the database security.Some solved method was given in the database currently.A new query algorithm was used to acquire improved encrypted data.The proposed algorithm uses average-value as principle to conceal the clear statement sequence.For field encryption,the information exposing was avoided by interference factor.A kind of information exposure of encrypted database was given in limited value area.The simulation results proved that the database security of modified method is higher than other method,and modified method has shorter response time.更多还原