Access control is a difficult security issue for enterprise organizations. Role-based access control (RBAC) model is well known and recognized as a good security model for enterprise environment. Though RBAC is a good model, administration of RBAC including building and maintaining access control information remains a difficult problem in large companies. RBAC model itself does not tell the sol...

We demonstrate how one can use the formal concept analysis (FCA) to obtain the role hierarchy for the role based access control from the existing access control matrix. We also discuss assesed by means of FCA the quality of security system and finding users with excess permissions.

In every communicative context, each participant assumes some kind of role and negotiates some type of relationship with their counterparts. In the e-learning domain, the roles (e.g. instructor, learner, marker, administrator, etc.) for participants are well structured and relationships (e.g. one-to-one, one-to-many, hierarchical, etc.) among roles are relatively predictable. This paper propose...

Generalized Temporal Role Based Access Control (GTRBAC) model that captures an exhaustive set of temporal constraint needs for access control has recently been proposed. GTRBAC’s language constructs allow one to specify various temporal constraints on role, user-role assignments and role-permission assignments. In this paper, we present the notion of different types of role hierarchies based on...

We propose an effective administration model using organizational structure for a decentralized role-based access control environment. Access control administration is a critical issue for large organizations and information systems. A large organization needs decentralized access control by multiple security officers because it has many users and information objects, and a single security offi...

Political culture represents a society`s widely held, traditional values and its fundamental practices; foreign policy decision makers tend to make policies that are compatible with their society`s political culture because they share, if not all, many of those values. Among the various factors influencing Iran`s foreign policy,  the role of political culture seems to be rather underestimated. ...