Access control requirements for preventing insider threats

Today the Intelligence Community (IC) has faced increasing challenges of insider threats. It is generally accepted that, the cost of insider threats exceeds that of outsider threats. Although the currently available access control approaches have a great potential for preventing insider threats, there are still critical obstacles to be solved, especially in large-scale computing environments. In this paper we discuss those requirements with respect to scalability, granularity, and context-awareness. For each requirement we discussed related problems, techniques, and basic approaches to the corresponding countermeasures. Detailed solutions and implementations are not described in this paper.