Sandhu-Ferraiolo Model
The Sandhu-Ferraiolo Model, also known as the Typed Access Matrix Model, is an extension of the Harrison-Ruzzo-Ullman (HRU) Model. It emphasizes on the introduction of types to differentiate between various subjects and objects in a system. By assigning types to subjects and objects, this model can enforce the separation of duties and prevent security violations. The Sandhu-Ferraiolo Model uses a typed access matrix to represent the relationships between the types of subjects, objects, and access rights. Access rights can be assigned or revoked based on the types, and system administrators can define the rules for accessing various objects based on the assigned type. This model provides a more organized approach to access control management and enhances the security by ensuring that each access request is implemented in accordance with the corresponding assigned types.
Guide: Sandhu-Ferraiolo Model
The Sandhu-Ferraiolo model is a security architecture model that is often brought up in the context of the Certified Information Systems Security Professional (CISSP) examination.
What it is: The Sandhu-Ferraiolo model is an enhanced version of the popular Bell-LaPadula model that addresses some of its limitations. Particularly, it revolves around the principle of 'no read up, no write down' - a major departure from the MLS (Multi-Level Security) concepts of the Bell-LaPadula model. The Sandhu-Ferraiolo model is sometimes also referred to as the 'typed access control model'.
Why it is important: Understanding the Sandhu-Ferraiolo model is important for any IT professional who is concerned with security architecture. Not only does it form a theoretical model for access control, but it also offers practical insight on how to manage access to resources within an organization. Moreover, the model is a commonly discussed point in exams such as CISSP
How it works: The crux of the Sandhu-Ferraiolo model is that users or processes can only read objects tagged with the same security level or lower (no read up). Similarly, they can only write to objects that are tagged with the same security level or higher (no write down)
Exam Tips: Answering Questions on Sandhu-Ferraiolo Model: When answering questions on the Sandhu-Ferraiolo model, it is important to understand not just how the model works, but also the reasoning behind its main principle. Be familiar with the concept of 'no read up, no write down' and ensure you understand what this means in practice. Given the complexity of such questions, it would be advisable to set aside more time to study this model
Additionally, when describing this model, ensure you explain that it is a security model built to address some of the limitations of prior models like Bell-LaPadula. Lastly, always add a touch of practical application – state how this model can be used to manage access to resources within an organization.
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