A Multilevel Secure Relational Database Model with key-polyinstantiation

摘要: In multilevel security there is a hierarchy of users or user-levels, in which each user has its own version information. Most the existing secure (MLS) data models support u-polyinstantiation. The only model that supports key-polyinstantiation was proposed by Gadia et al[GS1998, JS1990, CG1995], but work on it remains incomplete. It important for to because real world often case an object varies key value(s) (such as name, SSN, identification number etc.) when occurs beliefs different users. Thus having unique across limits our ability accurately world. Our focuses relational database model, and semantics defined SQL-like format since most are experienced using SQL hence such intuitive easy understand.