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Questions and Answers
What does the principle of Least Privilege entail?
What does the principle of Least Privilege entail?
Which of the following principles emphasizes simplicity in design?
Which of the following principles emphasizes simplicity in design?
What trade-off is often necessary in security design?
What trade-off is often necessary in security design?
What is the principle of Complete Mediation focused on?
What is the principle of Complete Mediation focused on?
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What does the term 'Open Design' refer to in security principles?
What does the term 'Open Design' refer to in security principles?
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What is the primary goal of the Economy of Mechanism principle?
What is the primary goal of the Economy of Mechanism principle?
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Which of the following best describes the principle of Complete Mediation?
Which of the following best describes the principle of Complete Mediation?
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What is meant by the phrase 'Open Design' in security principles?
What is meant by the phrase 'Open Design' in security principles?
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The principle of Separation of Privilege suggests that access should depend on what?
The principle of Separation of Privilege suggests that access should depend on what?
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What does the principle of Fail-Safe Defaults indicate about access rights?
What does the principle of Fail-Safe Defaults indicate about access rights?
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In terms of security mechanisms, what does the Least Common Mechanism principle advocate?
In terms of security mechanisms, what does the Least Common Mechanism principle advocate?
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Why is Psychological Acceptability important in security design?
Why is Psychological Acceptability important in security design?
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What is a common vulnerability identified in the inspection of the Diebold Voting Machines?
What is a common vulnerability identified in the inspection of the Diebold Voting Machines?
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What does the KISS principle stand for in the context of security mechanisms?
What does the KISS principle stand for in the context of security mechanisms?
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What should occur if access is needed temporarily according to security best practices?
What should occur if access is needed temporarily according to security best practices?
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What principle emphasizes limiting access to the minimum required for operation?
What principle emphasizes limiting access to the minimum required for operation?
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What strategy involves using multiple layers of defense to secure a system?
What strategy involves using multiple layers of defense to secure a system?
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What should be done to ensure systems fail in a safe manner?
What should be done to ensure systems fail in a safe manner?
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Which principle suggests that security measures should not interfere with rule-abiding users?
Which principle suggests that security measures should not interfere with rule-abiding users?
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What does the principle of compartmentalization aim to achieve?
What does the principle of compartmentalization aim to achieve?
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What is key to securing the weakest link in software security?
What is key to securing the weakest link in software security?
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Which of the following indicates a reluctance to extend trust?
Which of the following indicates a reluctance to extend trust?
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What does the principle of keeping it simple advocate for in security design?
What does the principle of keeping it simple advocate for in security design?
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Which principle signifies that relying solely on secrecy does not ensure security?
Which principle signifies that relying solely on secrecy does not ensure security?
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What is recommended for future security enhancements during planning?
What is recommended for future security enhancements during planning?
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What does the principle of promoting privacy entail regarding user information?
What does the principle of promoting privacy entail regarding user information?
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Which of the following emphasizes securing the most vulnerable parts of a system?
Which of the following emphasizes securing the most vulnerable parts of a system?
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In which scenario is security weakened significantly?
In which scenario is security weakened significantly?
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Study Notes
Security Design Principles
- Security is a system requirement, just like performance, capability, and cost.
- Security Requirements can be traded off against other system requirements.
Protection Mechanisms
- Least Privilege - Users should only have the rights necessary to complete their task.
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Economy of Mechanism - Security mechanisms should be small and simple.
- Simpler designs are easier to verify, implement, and debug.
- The KISS Principle (Keep It Simple, Stupid) applies to security.
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Complete Mediation - Every access to every object must be checked.
- Must be done efficiently at initialization, runtime, shutdown, and restart.
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Open Design - Don't depend on secrecy of the design.
- “Security through obscurity” is a bad idea.
- Should be open for scrutiny by the community.
- Diebold Voting Machines are an example where open design was not used.
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Separation of Privilege - Access to objects should depend on more than one condition being satisfied.
- Examples include Separation of Duty and the Two Person Rule.
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Least Common Mechanism - Minimize the amount of mechanism common to more than one user and depended on by all users.
- Every shared mechanism is a potential information path.
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Psychological Acceptability - User Interfaces should be easy to use to ensure users correctly apply security mechanisms.
- Security mechanisms should not add to the difficulty of accessing resources.
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Fail-Safe Defaults - The default is lack of access.
- Need to argue why a user should have access, not why they should not have access.
- If an action fails, the system should be as secure as when the action began.
Key Factors for Good Security Design
- Design security in from the start
- Allow for future security enhancements
- Minimize and isolate security controls
- Employ least privilege
- Structure the security relevant features
- Make security friendly
- Don’t depend on secrecy for security
Principles for Software Security
- Secure the weakest link - Identify and strengthen weak links until an acceptable level of risk is achieved.
- Practice defense in depth - Use diverse defensive strategies to ensure if one layer fails, another one will protect the system.
- Fail securely - Make sure that if your software fails, it does so securely.
- Follow the principle of least privilege - Only grant the minimum amount of access to a user necessary to perform an operation.
- Compartmentalize - Break the system into units to minimize the damage that can be done by a breach.
- Keep it simple - Complex designs are harder to understand.
- Promote privacy - System and code should be designed to avoid compromising users' privacy.
- Remember that hiding secrets is hard - Protection can be circumvented by skilled professionals (e.g. DVD viewers).
- Be reluctant to trust - Instead of making assumptions, you should be reluctant to extend trust.
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Description
Test your knowledge on essential security design principles that ensure systems are safe and efficient. This quiz will cover concepts such as least privilege, open design, and economy of mechanism. Understand how to balance security with other system requirements effectively.
