【作者】 李华； 周志逵；

【机构】 北京理工大学计算机科学工程系；

【摘要】 <正>1引言当前DBMS所采用的数据库安全技术主要有标识和鉴别、存取控制、信息流控制、推理控制、审计和加密等,其中应用最广也最为有效的是存取控制和加密技术。更多还原

【Abstract】 A two-phase encryption scheme with subkeys in multilevel database is proposed in this paper based on the two-phase encryption algorithm and the enhanced multilevel security(MLS)model.Each attribute in this scheme has a key-chain to generate its writing key and its reading key for a user.This scheme combines data encryption with Mandatory Access Control(MAC),so that it can implement the access rule of MAC in MLS and keep data which a user has no right to write in the encrypted form.更多还原