IoT Chapter Questions and Answers
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Questions and Answers

Which of the following describes the core function of IoT?

  • Creating a virtual reality experience for users
  • Facilitating advanced technological interfaces
  • Enabling rapid online financial transactions
  • Connecting physical objects to the Internet for data exchange (correct)

    • Which protocol is primarily used to handle communications in constrained IoT networks?

  • FTP
  • HTTP
  • CoAP (correct)
  • SMTP

    • What is the primary goal of employing lightweight cryptographic hash functions in IoT?

  • To enhance data encryption speed
  • To reduce hardware dependencies
  • To minimize resource usage on devices with limited capabilities (correct)
  • To ensure faster decryption

    • What does DTLS primarily achieve when used in IoT security protocols?

    <p>Secure datagram transmission for connectionless protocols (C)</p> Signup and view all the answers

    Which scenario best exemplifies a malicious substitution attack in the context of IoT?

    <p>An attacker replacing a legitimate smart device with a fake one (A)</p> Signup and view all the answers

    Which aspect of secure IoT communication focuses on ensuring that data remains unaltered during transmission or storage?

    <p>Integrity (A)</p> Signup and view all the answers

    How does ECC (Elliptic Curve Cryptography) primarily benefit IoT devices compared to traditional cryptographic methods?

    <p>Provides comparable security with vastly smaller keys (A)</p> Signup and view all the answers

    Which security challenge in IoT is specifically caused by the large variety of devices and interfaces?

    <p>Standardization and interoperability (D)</p> Signup and view all the answers

    Which of the following is primarily used to secure data at the transport layer for IoT devices?

    <p>DTLS (D)</p> Signup and view all the answers

    What is the main advantage of using Elliptic Curve Cryptography (ECC) over RSA in IoT environments?

    <p>Reduced computational power usage (B)</p> Signup and view all the answers

    What is the primary function of a cryptographic hash function in securing IoT communications?

    <p>To ensure data integrity and verify authenticity (C)</p> Signup and view all the answers

    What is the main purpose of the Scalable Encryption Algorithm (SEA) in the context of IoT?

    <p>To provide flexible security for devices with limited resources (A)</p> Signup and view all the answers

    What is a key characteristic of lightweight cryptographic algorithms used in IoT, often contrasting with traditional counterparts?

    <p>Use of short keys and reduced power consumption (C)</p> Signup and view all the answers

    What is the primary challenge when implementing IPSec in IoT devices?

    <p>High resource consumption that affects constrained devices (D)</p> Signup and view all the answers

    What does the integrity property ensure in the context of data security during transmission in IoT?

    <p>The data remains unaltered and untampered during transit (A)</p> Signup and view all the answers

    Which cryptographic method is specifically employed to establish a shared secret key over an insecure channel?

    <p>Diffie-Hellman (A)</p> Signup and view all the answers

    What is the main purpose of the 6LoWPAN protocol?

    <p>To compress IPv6 headers for low-power networks. (D)</p> Signup and view all the answers

    The PRESENT cipher is designed specifically for what type of environment?

    <p>Constrained environments characterized by low power and limited resources. (A)</p> Signup and view all the answers

    Which of these attacks takes advantage of open communications channels in the IoT?

    <p>A man-in-the-middle attack where an attacker intercepts communications. (A)</p> Signup and view all the answers

    In IoT security, what does the term 'forward secrecy' protect against?

    <p>Previously compromised keys allowing access to communications. (C)</p> Signup and view all the answers

    What is a significant drawback of using RSA encryption for IoT devices?

    <p>RSA's complex computation leads to high power consumption. (B)</p> Signup and view all the answers

    Which of the following is classified as a lightweight block cipher algorithm?

    <p>PRESENT, which is designed for constrained environments. (D)</p> Signup and view all the answers

    What is the primary concept behind ‘homomorphic’ enryption?

    <p>It enables computation on encrypted data without first decrypting it. (A)</p> Signup and view all the answers

    In IoT networks, what role does a security gateway primarily perform?

    <p>It works as a firewall to protect the internal network from external threats. (B)</p> Signup and view all the answers

    What block size is used by the Tiny Encryption Algorithm (TEA)?

    <p>64 bits (A)</p> Signup and view all the answers

    What is the principal limitation of traditional IPSec in many IoT deployments?

    <p>It requires significant computational resources. (D)</p> Signup and view all the answers

    Which protocol uses the Host Identity Protocol (HIP) namespace?

    <p>IPSec (B)</p> Signup and view all the answers

    Which of these cryptographic methods relies on modular exponentiation?

    <p>RSA (B)</p> Signup and view all the answers

    What is a major challenge when using DTLS with multicast communication?

    <p>It does not easily support multicast. (C)</p> Signup and view all the answers

    Which of these is considered a symmetric-key cryptographic algorithm?

    <p>TEA (B)</p> Signup and view all the answers

    What is the main aim of lightweight cryptography in the context of IoT?

    <p>To balance performance with resource constraints. (C)</p> Signup and view all the answers

    Which cipher uses substitution-permutation networks as part of its encryption process?

    <p>PRESENT (C)</p> Signup and view all the answers

    What is the key distinction between fully homomorphic encryption and partially homomorphic encryption?

    <p>Fully homomorphic encryption supports both addition and multiplication, while partially supports only one of them. (D)</p> Signup and view all the answers

    What is the fundamental role of the Diffie-Hellman protocol in IoT security?

    <p>To establish a secure channel for exchanging encryption keys. (D)</p> Signup and view all the answers

    Which of the following is encompassed by group-key distribution in IoT networks?

    <p>All of these choices accurately define group-key distribution. (B)</p> Signup and view all the answers

    What is a significant difficulty in key management for IoT devices?

    <p>The challenge of securely distributing keys among devices with limited resources. (C)</p> Signup and view all the answers

    Which cryptographic technique is employed for message integrity verification?

    <p>Hash functions. (D)</p> Signup and view all the answers

    Which of these is NOT a symmetric key encryption method?

    <p>RSA (B)</p> Signup and view all the answers

    Why is Elliptic Curve Cryptography (ECC) often preferred for IoT devices?

    <p>ECC uses smaller keys offering equivalent security compared to RSA. (A)</p> Signup and view all the answers

    What is the main goal of using lightweight cryptographic hash functions like SPONGENT and PHOTON in IoT?

    <p>To minimize energy and hardware usage. (A)</p> Signup and view all the answers

    Study Notes

    IoT Chapter Questions and Answers

    • Question 1: What does IoT stand for?

      • Answer: Internet of Things

    • Question 2: Which protocol is foreseen as the standard for IoT interoperability?

      • Answer: IPv6

    • Question 3: What are common security challenges in IoT?

      • Answer: Low computational power of devices, standardization and interoperability issues, privacy threats and data breaches

    • Question 4: What is the primary role of lightweight cryptographic algorithms in IoT?

      • Answer: Minimize processing and memory usage

    • Question 5: Which of the following is a property of secure communication in IoT?

      • Answer: Confidentiality, integrity, and authenticity

    • Question 6: What type of attack involves substituting smart devices during installation?

      • Answer: Malicious substitution attack

    • Question 7: What does DTLS stand for in IoT security protocols?

      • Answer: Datagram Transport Layer Security

    • Question 8: Which protocol is specifically designed for resource-constrained devices?

      • Answer: CoAP

    • Question 9: What is the primary benefit of using ECC (Elliptic Curve Cryptography) in IoT?

      • Answer: Provides higher security with shorter keys

    • Question 10: What is the primary goal of lightweight cryptographic hash functions in IoT?

      • Answer: Minimize resource usage in constrained devices

    • Question 11: What is the purpose of CoAP in IoT?

      • Answer: To provide a lightweight alternative to HTTP

    • Question 12: What is a key feature of the 6LoWPAN protocol?

      • Answer: Compression of IPv6 headers

    • Question 13: What does the PRESENT cipher primarily target?

      • Answer: Constrained environments with low power consumption

    • Question 14: Which attack exploits unprotected communication channels in IoT?

      • Answer: Man-in-the-middle attack

    • Question 15: What does the term "forward secrecy" in IoT security imply?

      • Answer: Old group members cannot access current communications

    • Question 16: What is a disadvantage of RSA encryption for IoT devices?

      • Answer: High computational requirements

    • Question 17: Which is an example of a lightweight block cipher algorithm?

      • Answer: PRESENT

    • Question 18: What does the term "homomorphic encryption" refer to?

      • Answer: Computation on encrypted data without decryption

    • Question 19: What is the primary function of a Security Gateway in IoT networks?

      • Answer: To prevent unauthorized access to internal networks

    • Question 20: What mechanism can be used to achieve multicast security in IoT?

      • Answer: DTLS records

    • Question 21: Which cryptographic method is used to generate a shared key for secure communication?

      • Answer: Diffie-Hellman

    • Question 22: What is the purpose of a cryptographic hash function in IoT?

      • Answer: To provide data integrity and authentication

    • Question 23: What is a common characteristic of lightweight cryptographic algorithms?

      • Answer: Short keys and low power consumption

    • Question 24: What is the primary challenge of implementing IPSec in IoT?

      • Answer: Excessive resource consumption in constrained devices

    • Question 25: What is the main advantage of Elliptic Curve Cryptography (ECC) over RSA in IoT?

      • Answer: ECC uses less computational power

    • Question 26: What is the main purpose of the Scalable Encryption Algorithm (SEA)?

      • Answer: To support flexibility and adaptability for constrained devices

    • Question 27: Which protocol helps secure end-to-end communication at the transport layer in IoT?

      • Answer: DTLS

    • Question 28: What is the primary advantage of providing security at the application layer in IoT?

      • Answer: Ensures complete end-to-end security

    • Question 29: Which property ensures that data cannot be tampered with during transmission?

      • Answer: Integrity

    • Question 30: What is the typical block size of the Tiny Encryption Algorithm (TEA)?

      • Answer: 64 bits

    • Question 31: What is a limitation of the traditional IPSec protocol in IoT scenarios?

      • Answer: It does not support authentication headers

    • Question 32: Which security protocol uses the Host Identity Protocol (HIP) namespace?

      • Answer: IPSec

    • Question 33: Which cryptographic method is based on modular exponentiation?

      • Answer: RSA

    • Question 34: What is a significant drawback of using multicast communication in DTLS?

      • Answer: No compatibility with multicast communication

    • Question 35: Which of the following is a symmetric-key cryptographic algorithm?

      • Answer: TEA

    • Question 36: What is the primary focus of lightweight cryptography for IoT?

      • Answer: Balancing performance and resource constraints

    • Question 37: Which algorithm uses substitution-permutation networks for encryption?

      • Answer: PRESENT

    • Question 38: What is the primary concern when designing cryptographic hash functions for IoT?

      • Answer: Minimizing hardware and energy usage

    • Question 39: What is the primary use of homomorphic encryption in IoT?

      • Answer: To allow operations on encrypted data without decryption

    • Question 40: What is the main difference between partially and fully homomorphic encryption?

      • Answer: Fully homomorphic encryption supports both addition and multiplication, while partially supports only one of them.

    • Question 41: What is the primary role of the Diffie-Hellman protocol in IoT?

      • Answer: Facilitate secure key agreement

    • Question 42: What is a critical feature of group-key distribution in IoT networks?

      • Answer: All of the above (provides backward secrecy, ensures forward secrecy, manages cryptographic material updates).

    • Question 43: What is one challenge of key management in IoT networks?

      • Answer: Securely distributing keys among constrained devices.

    • Question 44: Which cryptographic primitive is most commonly used for message integrity verification?

      • Answer: Hash functions

    • Question 45: Which of the following is NOT a symmetric-key encryption method?

      • Answer: RSA

    • Question 46: What makes the Elliptic Curve Cryptography (ECC) algorithm suitable for IoT?

      • Answer: It uses shorter keys for the same security level as RSA.

    • Question 47: What is the primary purpose of lightweight cryptographic hash functions like SPONGENT and PHOTON in IoT?

      • Answer: To minimize hardware and energy consumption.

    • Question 48: Why is CoAP preferred over HTTP in IoT?

      • Answer: CoAP is designed to run over UDP, making it lightweight.

    • Question 49: What is the main advantage of using AES over lightweight ciphers in IoT?

      • Answer: Established standard with strong security

    • Question 50: Why is authorization a critical aspect of IoT security?

      • Answer: To ensure only authorized entities can access sensitive data

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