Non-Interference Model

5 minutes 5 Questions

The Non-Interference Model, created by Joseph Goguen and Jose Meseguer in 1982, aims to prevent information leakage between security levels. It's based on the concept of 'non-interference', meaning that actions at one security level should not impact anothe security level. Users at a lower security level should not be aware of actions taken by users at a higher security level. This model helps to maintain confidentiality and prevent information leakage, but it has limited real-world applicability due to its strict non-interference policy. It's often used in combination with other models to create a more comprehensive security architecture.

Non-Interference Model Guide

What is Non-Interference Model:
The Non-Interference Model is a security architecture model used in the field of Computer Security to ensure that the actions of one user or process do not interfere with the actions of another. The principle states that an action in a high-security level should not have influences on a lower security level ensuring a system's security.

Importance of Non-Interference Model:
The Non-Interference Model is important as it offers a level of security assurance by preventing information leakage between different security domains, especially from high to low

How Non-Interference Model Works:
It works by ensuring that a subject at a certain security level doesn't affect or interfere with any objects at other security levels. Actions in the high-security levels are not visible to the lower levels and thus, users in lower levels cannot infer any information about the higher levels.

Exam Tips: Answering Questions on Non-Interference Model:
1. Understand the concept: Have a clear understanding of the Non-Interference Model and its functions. It is about isolation and preventing cross-domain impact.
2. Principle: Remember that 'High-level actions' should not interfere with 'low-level actions'. This encapsulates the idea of the model.
3. Examples: Be prepared to give examples of how the non-interference model operates, or could operate, in real-world scenarios.

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Question 1

You are reviewing a company's access control policies. They primarily follow a non-interference model, but have recently introduced additional access control restrictions for confidential projects. Which measure should be taken to maintain the adherence to the Non-Interference Model?

Enhance Mandatory Access Control Implement Group Policies Use Separate Environments Limit User Access

Correct Answer: Use Separate Environments

Using separate environments ensures that users without access to confidential projects won't be affected by the actions or information of users with higher access levels.

Question 2

You are a security officer in a multinational corporation. The company wants to deploy an access control model that ensures no information flows from high-sensitive personnel to low-sensitive personnel. Which model would be the best choice?

Discretionary Access Control Non-Interference Model Mandatory Access Control Role-Based Access Control

Correct Answer: Non-Interference Model

Non-Interference Model is designed to preventing any information flow between security levels. This ensures that actions performed by high-sensitive subjects don't influence low-sensitive subjects.

Question 3

An organization wants to enforce separation of duties while following a Non-Interference Model. When implementing this model, which property or concept should be considered?

Least Privilege Principle Non-deducibility Read-Up/Write-Down Mandatory Access Control

Correct Answer: Non-deducibility

Non-deducibility ensures that low-sensitive subjects cannot deduce the actions or information of high-sensitive subjects in a Non-Interference Model, enforcing separation of duties.

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