Mobile Communication History: A-Network and B/B2-Network
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Questions and Answers

What is the main function of the ENVELOPE command in GSM technology?

  • To interact between the Mobile Equipment (ME) and the SIM card (correct)
  • To provide international roaming support
  • To control the call by the SIM card
  • To display text on the ME screen
  • In GSM technology, what is the purpose of the SAT Commands: I/O DISPLAY TEXT?

  • To support handheld terminals
  • To display text or menus on the Mobile Equipment (ME) screen (correct)
  • To control call switching between networks
  • To manage high-quality voice transmission
  • Which part of GSM technology is responsible for call control by the SIM card?

  • SIM Application Toolkit (SAT) (correct)
  • Groupe Spécial Mobile (GSM)
  • European Telecommunication Standards Institute (ETSI)
  • Phase I of the GSM specifications
  • What component in a GSM network is responsible for managing call routing and roaming information?

    <p>HLR (Home Location Register)</p> Signup and view all the answers

    Which GSM component holds security-related information for authentication purposes?

    <p>AUC (Authentication Center)</p> Signup and view all the answers

    In GSM networks, which entity is responsible for managing the interaction between the Mobile Equipment (ME) and the SIM (Subscriber Identity Module)?

    <p>IWF (Interworking Function)</p> Signup and view all the answers

    What is the responsibility of GSM/MoU regarding the internal specification of Algorithm A5 in GSM?

    <p>Managing the internal specification of Algorithm A5</p> Signup and view all the answers

    In GSM authentication, what is the purpose of the Individual Subscriber Authentication Key Ki?

    <p>Computing the signature SRES from RAND using algorithm A3</p> Signup and view all the answers

    What entity in GSM manages the proposals for Algorithm A3 and A8?

    <p>GSM/MoU</p> Signup and view all the answers

    What happens when the fixed subsystem tests the signature SRES for validity in GSM authentication?

    <p>The fixed subsystem verifies if SRES is correct</p> Signup and view all the answers

    In GSM authentication, what does the Mobile Equipment (ME) transmit to the fixed subsystem for validation?

    <p>Signature of a non-predictable number RAND</p> Signup and view all the answers

    Which algorithm is used by the Mobile Station (MS) to compute the signature SRES in GSM authentication?

    <p>Algorithm A3</p> Signup and view all the answers

    What is the purpose of Algorithm A5 in GSM technology?

    <p>Encryption of user data</p> Signup and view all the answers

    What is the responsibility of the infrastructure in GSM encryption?

    <p>Selecting the ciphering algorithm based on priority</p> Signup and view all the answers

    In GSM, what happens if a Mobile Station (MS) indicates it does not support any of the ciphering algorithms required by GSM 02.07?

    <p>The MS is disconnected from the network</p> Signup and view all the answers

    What is the purpose of Algorithm A8 in GSM according to GSM 03.20?

    <p>Computing the ciphering key Kc from the random challenge RAND during authentication</p> Signup and view all the answers

    What is a specific security problem with the COMP 128 authentication algorithm used by some operators in GSM networks?

    <p>Susceptible to collision attacks, where the key can be determined with knowledge of about 160,000 challenges</p> Signup and view all the answers

    Which attack on the GSM cipher A5/1 is NOT mentioned in the text?

    <p>Side-channel attacks exploiting power consumption</p> Signup and view all the answers

    In a chosen-challenge attack on COMP128 in GSM networks, what is required to determine the Individual Subscriber Authentication Key (Ki)?

    <p>Physical access to the SIM card for about 150,000 queries</p> Signup and view all the answers

    What critical question does the text highlight regarding GSM security algorithms?

    <p>How long do secret, proprietary algorithms 'last' in terms of security?</p> Signup and view all the answers

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