Organisations and information security practitioners are increasingly adept at addressing the threat posed by cyber-attack from external actors, however, the risks associated with trusted parties or insiders is often overlooked. The insider threat poses a significant risk with potentially severe consequences and as such deserves rigorous treatment within organisational risk management and security plans. This article provides an introduction to the insider risk, providing a basis from which information security professionals can begin to assess the risk to their own organisation and prepare accordingly. The author begins with an examination of the actors, motivations and form of insider attacks in conjunction with an overview of a number of conceptual models for describing and understanding them. The article then goes on to look at methods for protecting against insider attacks, discussing general approaches and providing a summary of best practice.
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