Covert Channels and Communication Quiz
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Questions and Answers

Which of the following best describes authentication?

  • Determining what actions an authenticated user is allowed to perform
  • Restricting access to the system based on user identity
  • Verifying the identity of a user (correct)
  • Managing access control lists

    • What is the main purpose of authorization?

  • Determining what actions an authenticated user is allowed to perform (correct)
  • Managing access control lists
  • Verifying the identity of a user
  • Restricting access to the system based on user identity

    • Which access control mechanism uses an access control matrix?

  • Access Control Lists (ACLs) (correct)
  • Capabilities (C-lists)
  • Authentication
  • OS Accounting

    • What is the challenge of managing a large access control matrix?

    <p>Efficiently managing a matrix with a large number of entries</p> Signup and view all the answers

    What is the purpose of checking the access control matrix before allowing access to a resource?

    <p>Determining what actions an authenticated user is allowed to perform</p> Signup and view all the answers

    Which of the following is NOT an access control mechanism mentioned in the text?

    <p>Authentication</p> Signup and view all the answers

    Which type of intrusion detection system (IDS) can have both host and network capabilities?

    <p>Anomaly Detection</p> Signup and view all the answers

    What can failed login attempts indicate in the context of intrusion detection?

    <p>Password cracking attack</p> Signup and view all the answers

    In signature detection, what is the purpose of setting values for N and M?

    <p>To slow down the attacker</p> Signup and view all the answers

    What are the challenges in anomaly detection systems?

    <p>Identifying abnormal behavior</p> Signup and view all the answers

    What statistical technique can be used to measure abnormal behavior in anomaly detection?

    <p>Bayesian statistics</p> Signup and view all the answers

    What is the advantage of using anomaly detection in intrusion detection systems?

    <p>Detecting unknown attacks</p> Signup and view all the answers

    Which of the following is a characteristic of covert channels?

    <p>They are virtually impossible to eliminate in any useful system</p> Signup and view all the answers

    How long would it take to leak a 256-bit AES key through a covert channel with a capacity of 1 bit per second?

    <p>Less than 5 minutes</p> Signup and view all the answers

    What is the purpose of a CAPTCHA?

    <p>To allow only humans to access certain resources</p> Signup and view all the answers

    What is the meaning of the acronym OCR in the context of CAPTCHAs?

    <p>Optical Character Recognition</p> Signup and view all the answers

    What is the role of a firewall in a network?

    <p>To provide secure access to the network</p> Signup and view all the answers

    What type of firewall works at the application layer?

    <p>Application proxy</p> Signup and view all the answers

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