Lecture 7 (medium)
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Questions and Answers

What is the purpose of full-disk encryption in Android?

  • To allow apps to operate within a limited context
  • To provide more granular controls over user permissions
  • To protect user data by encoding all data on the device using symmetric encryption keys (correct)
  • To encrypt different files with different keys
  • Which feature does file-based encryption introduce in Android 7.0?

  • Encrypting directory layouts and file sizes (correct)
  • Encrypting all files with the same key
  • Encrypting directory names only
  • Allowing apps to access any file on the device
  • What type of data is encrypted by metadata encryption in Android?

  • File names
  • File creation/modification times (correct)
  • Directory permissions
  • File content
  • Which security best practice involves ensuring the software collects only the necessary information?

    <p>Collecting only the information required by the software</p> Signup and view all the answers

    Why is the Secure Enclave used in iOS for biometric data processing?

    <p>To provide an extra layer of security for user biometric data</p> Signup and view all the answers

    What is a thread in the context of mobile application development?

    <p>A thread is a lightweight way to implement multiple paths of execution inside an application.</p> Signup and view all the answers

    What is the main advantage of having a multithreaded application?

    <p>Increased responsiveness and real-time performance on multicore systems.</p> Signup and view all the answers

    What are the challenges associated with multithreaded applications?

    <p>Threads coordinate actions to prevent corruption of the application's state information.</p> Signup and view all the answers

    What is a key rule for writing efficient code in mobile applications?

    <p>Don't do work that you don't need to do.</p> Signup and view all the answers

    What is the recommended approach to handle power consumption in mobile applications?

    <p>Let the chip idle when using hardware and execute code in bursts to save energy.</p> Signup and view all the answers

    What are the main challenges associated with multithreaded applications?

    <p>Coordinating actions between threads to prevent corruption of application's state information.</p> Signup and view all the answers

    What is the key rule for handling power consumption in mobile applications?

    <p>Let the chip idle and avoid continuous polling for information.</p> Signup and view all the answers

    Explain the purpose of full-disk encryption in Android.

    <p>Full-disk encryption encrypts all data on the device to protect it from unauthorized access.</p> Signup and view all the answers

    What type of data is encrypted by metadata encryption in Android?

    <p>Sensitive file metadata such as file sizes and permissions.</p> Signup and view all the answers

    What feature does file-based encryption introduce in Android 7.0?

    <p>File-based encryption allows each user profile to have its own encrypted data partition.</p> Signup and view all the answers

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