Dynamic Counter-measures for Risk-based Access Control Systems: An Evolutive Approach

Risk-based access control systems are a new element in access control categories, incorporating risk analysis as part of the inputs to consider when taking an authorization decision. A risk analysis over a resource leads generally to temporal allocation of the resource in a risk level (e.g. high, medium, low). Ideally, for each risk level and kind of resource, the access control system should take an authorization decision (expressed like a permit or deny) and the system administrator should also trigger specific counter-measures to protect resources according to their risk level. In a small access control system with few resources it is possible for an administrator to follow the risk level changes and react promptly with counter-measures; but in medium/large access control systems it is almost unfeasible to react in a customized way to thousands of risk level emergencies asking for attention. In this paper we propose the adoption of dynamic counter-measures (which can be integrated within access control policies) changing along time to face variations in the risk level of every resource, bringing two main benefits, namely: (i) a suitable resource protection according to the risk level (not under or over estimated) and (ii) an access control system granting/denying access depending on the fulfillment of a set of security controls applicable in an authorization access request. To define the most appropriate set of counter-measures applicable for a specific situation we define a method based on genetic algorithms, which allows to find a solution in a reasonable time frame satisfying different required conditions. Finally, the conducted experiments show the applicability of our proposal in a real scenario.

• Fecha de publicación: 2016
• Institución: Universidad del Rosario
• Repositorio: Repositorio EdocUR - U. Rosario
• Idioma: eng
• OAI Identifier: oai:repository.urosario.edu.co:10336/27550
• Acceso en línea: https://doi.org/10.1016/j.future.2014.10.012; https://repository.urosario.edu.co/handle/10336/27550
• Palabra clave: ISO 27001; ISMS; Risk management; Access control systems; Genetic algorithms; Counter-measures
• License: Restringido (Acceso a grupos específicos)