Hacking Smartcards and Microcontrollers: Noninvasive Attacks
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Questions and Answers

What was the purpose of the Clipper chip designed by the U.S. government in 1993?

  • To enable the government to decrypt any encrypted traffic (correct)
  • To create a more secure form of RAM
  • To enhance the speed of data encryption
  • To allow users to encrypt data securely
  • In the context of smartcards, what is stored in the EEPROM?

  • The Law Enforcement Access Field (LEAF)
  • The ciphertext
  • Key material (correct)
  • The user-supplied key
  • What problem do EEPROM-based devices face when erasing information?

  • High voltage requirement for erasure (correct)
  • Low sensitivity to voltage changes
  • Inability to store volatile information
  • Quick depletion of stored data
  • How did attackers manipulate early smartcards in pay-TV systems?

    <p>By tampering with the programming voltage connection on the card</p> Signup and view all the answers

    Which operation does Capstone include along with public key encryption and digital signatures?

    <p>Cipher instruction search attack prevention</p> Signup and view all the answers

    What key information does Clipper return along with the ciphertext when encrypting data?

    <p>User-supplied key encrypted under a known government key</p> Signup and view all the answers

    What role does the Law Enforcement Access Field (LEAF) play in Clipper's encryption process?

    <p>It contains the encrypted user-supplied key</p> Signup and view all the answers

    Why is it a concern if an attacker can remove the charge stored in EEPROM memory cells?

    <p>The information stored becomes vulnerable</p> Signup and view all the answers

    How did attackers prevent certain channels from being deactivated in pay-TV systems?

    <p>By tampering with broadcast signals</p> Signup and view all the answers

    What was a common way that subscribers manipulated their smartcards in pay-TV systems to prevent deactivation of channels they didn't pay for?

    <p>Clamping the card inside the decoder using a diode</p> Signup and view all the answers

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