Security Design Principles Quiz
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Security Design Principles Quiz

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Questions and Answers

What does the principle of Least Privilege entail?

  • All permissions should be granted to system administrators.
  • Access should be based on user’s personal preferences.
  • Users should have unlimited access to resources.
  • Users should only have the rights necessary to complete their tasks. (correct)

    • Which of the following principles emphasizes simplicity in design?

  • Complete mediation
  • Economy of mechanism (correct)
  • Separation of privilege
  • Open design

    • What trade-off is often necessary in security design?

  • Security requirements must always outweigh performance.
  • Cost considerations should never affect security decisions.
  • Complexity is prioritized over user needs.
  • Certain security requirements may need to be traded off to gain others. (correct)

    • What is the principle of Complete Mediation focused on?

    <p>Ensuring that all accesses to objects are checked for authorization.</p> Signup and view all the answers

    What does the term 'Open Design' refer to in security principles?

    <p>Security should not depend on the ignorance of potential attackers.</p> Signup and view all the answers

    What is the primary goal of the Economy of Mechanism principle?

    <p>To keep security mechanisms as simple as possible</p> Signup and view all the answers

    Which of the following best describes the principle of Complete Mediation?

    <p>All access to objects must be verified upon every request</p> Signup and view all the answers

    What is meant by the phrase 'Open Design' in security principles?

    <p>The design should be open for public inspection and scrutiny</p> Signup and view all the answers

    The principle of Separation of Privilege suggests that access should depend on what?

    <p>Multiple conditions being satisfied</p> Signup and view all the answers

    What does the principle of Fail-Safe Defaults indicate about access rights?

    <p>The default setting should be to deny access</p> Signup and view all the answers

    In terms of security mechanisms, what does the Least Common Mechanism principle advocate?

    <p>Minimizing shared mechanisms across users reduces risk</p> Signup and view all the answers

    Why is Psychological Acceptability important in security design?

    <p>The user interface needs to be intuitive for proper use of mechanisms</p> Signup and view all the answers

    What is a common vulnerability identified in the inspection of the Diebold Voting Machines?

    <p>Passwords were embedded in the source code</p> Signup and view all the answers

    What does the KISS principle stand for in the context of security mechanisms?

    <p>Keep it simple, stupid</p> Signup and view all the answers

    What should occur if access is needed temporarily according to security best practices?

    <p>Access should be revoked immediately after use</p> Signup and view all the answers

    What principle emphasizes limiting access to the minimum required for operation?

    <p>Follow the principle of least privilege</p> Signup and view all the answers

    What strategy involves using multiple layers of defense to secure a system?

    <p>Practice defense in depth</p> Signup and view all the answers

    What should be done to ensure systems fail in a safe manner?

    <p>Fail securely</p> Signup and view all the answers

    Which principle suggests that security measures should not interfere with rule-abiding users?

    <p>Make security friendly</p> Signup and view all the answers

    What does the principle of compartmentalization aim to achieve?

    <p>Minimize potential damage</p> Signup and view all the answers

    What is key to securing the weakest link in software security?

    <p>Identify and strengthen vulnerabilities</p> Signup and view all the answers

    Which of the following indicates a reluctance to extend trust?

    <p>Challenging assumptions that should hold true</p> Signup and view all the answers

    What does the principle of keeping it simple advocate for in security design?

    <p>Simplicity prevents user confusion</p> Signup and view all the answers

    Which principle signifies that relying solely on secrecy does not ensure security?

    <p>Don't depend on secrecy for security</p> Signup and view all the answers

    What is recommended for future security enhancements during planning?

    <p>Allow for future flexibility</p> Signup and view all the answers

    What does the principle of promoting privacy entail regarding user information?

    <p>Minimize user data retention</p> Signup and view all the answers

    Which of the following emphasizes securing the most vulnerable parts of a system?

    <p>Secure the weakest link</p> Signup and view all the answers

    In which scenario is security weakened significantly?

    <p>Increased complexity in the design</p> Signup and view all the answers

    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.
    • 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.
    • Complete Mediation - Every access to every object must be checked.
      • Must be done efficiently at initialization, runtime, shutdown, and restart.
    • 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.
    • 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.
    • 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.
    • 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.
    • 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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    Related Documents

    Principles of Design Security - CS177 2012 PDF

    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.

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