Abstract
e-Government services require intensive information exchange and interconnection among governmental agencies to provide specialized online services and allow informed decision-making. This could compromise the integrity, confidentiality, and/or availability of the information being exchanged. Government agencies are accountable and liable for the protection of information they possess and use on a least privilege security principle basis even after dissemination. However, traditional access control models are short of achieving this as they do not allow dynamic access to unknown users to the system, they do not provide security controls at a fine-grained level, and they do not provide persistent control over this information. This paper proposes a novel secure access control model for cross-governmental agencies. The secure model deploys a Role-centric Mandatory Access Control MAC (R-MAC) model, suggests a classification scheme for e-Government information, and enforces its application using XML security technologies. By using the proposed model, privacy could be preserved by having dynamic, persistent, and fine-grained control over their shared information.