Majority of the research in multilevel secure database management systems (MLS/DBMS) focuses primarily on centralized database systems. However, with the demand for higher performance and higher availability, database systems have moved from centralized to distributed architectures, and the research in multilevel secure distributed database management systems (MLS/DDBMS) is gaining more and mor...

Rapid development of e-government has exposed critical public information to the possibility of cybercrime. Information security has become a critical issue that needs to be adequately addressed in egovernment development. This paper develops an information security compliance model by drawing insights from organizational and institutional theory literature to examine how organizational securit...

Database security mainly deal with the secrecy, integrity and availability of data stored in a database. The common threats to the databases involve Privilege Abuse, Weak Authentication, Weak Audit Trails and Operating System Vulnerabilities. To make the security least compromised; all users are required to follow the rules set up by Database Administrator. These rules are said to be Mandatory ...

In a multilevel security environment, the security levels form a hierarchy which is generally assumed to be a lattice. A user can see not only its own information, but also information belonging to lower users. In a multilevel security database, different users have different beliefs (versions of information) about the same real world object. In this paper we present a relational model SecDB fo...

In a multilevel security database there are multiple beliefs about a given real world object. The ability of a database model to accommodate multiple beliefs is termed polyinstantiation in the multilevel security literature. In this paper we remark that in an abstract sense polyinstantiation is a priori present in all models for temporal and spatial databases. In particular we investigate the a...

Today, few companies would manage to continuously stay competitive without the proper utilization of information technology (IT). This has increased companies’ dependency of IT and created new threats that need to be addressed to mitigate risks to daily business operations. A large extent of these IT-related threats includes hackers attempting to gain unauthorized access to internal computer ne...

in this paper, a new cascaded multilevel inverter by capability of increasing the number of output voltage levels with reduced number of power switches is proposed. the proposed topology consists of series connection of a number of proposed basic multilevel units. in order to generate all voltage levels at the output, five different algorithms are proposed to determine the magnitude of dc volta...

Although there are several e orts underway to build multilevel secure relational database management systems, there is no clear consensus regarding what a multilevel secure relational data model exactly is. In part this lack of consensus on fundamental issues reects the subtleties involved in extending the classical (single-level) relational model to a multilevel environment. Our aim in this pa...

Mandatory access control models have traditionally been employed as a robust security mechanism in multilevel security environments such as military domains. In traditional mandatory models, the security classes associated with entities are context-insensitive. However, context-sensitivity of security classes and flexibility of access control mechanisms may be required especially in pervasive c...