What security principle emphasizes the need for a simple and small design?

• A. Economy of Mechanism
• B. Isolation
• C. Encapsulation
• D. Layering

Answer: (A)

The security principle that emphasizes the need for a simple and small design is known as Economy of Mechanism. This principle is based on the idea that systems with simpler designs are easier to understand, implement, and manage, which can lead to fewer vulnerabilities and security risks. A simpler system reduces the chances of unintentional errors during development and maintenance because there are fewer elements to interact and potentially conflict with each other. This simplification increases the likelihood that the security features can be effectively implemented and audited.

In the context of security, adhering to this principle means that when designing systems or applications, one should aim for minimal complexity to enhance both security and reliability. Such designs can be more easily analyzed for vulnerabilities and are generally more robust against various attack vectors.

The other principles mentioned work in different contexts—Isolation pertains to separating system components to limit access, Encapsulation involves restricting access to certain components of a system, while Layering refers to implementing multiple security controls in a systematic manner. Although these are important principles, they do not specifically emphasize the aspect of simplicity and minimalism as Economy of Mechanism does.