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Quantum-Safe Group Key Establishment Protocol from Lattice Trapdoors.

Teklay Gebremichael1, Mikael Gidlund1, Gerhard P Hancke2

  • 1Department of Information Systems and Technology, Mid Sweden University, 852 30 Sundsvall, Sweden.

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|June 10, 2022
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Summary
This summary is machine-generated.

This study introduces a new lattice-based cryptography method for secure Internet of Things (IoT) group communication. It offers quantum-resistant encryption and efficient key management for resource-constrained devices.

Keywords:
IoT group keyLWElattice trapdoorslattice-based crypotgraphylatticeslearning with errorslightweight cryptographyone-way functionquantum-safe cryptographyshort basis

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Area of Science:

  • Cryptography
  • Computer Science
  • Network Security

Background:

  • Group communication in IoT requires secure, efficient key establishment.
  • Existing methods may be vulnerable to quantum computing attacks.
  • Resource constraints in IoT devices limit complex cryptographic operations.

Purpose of the Study:

  • To develop a novel lattice-based group key establishment protocol for IoT.
  • To provide conjectured resistance against quantum computing threats.
  • To ensure efficient and constant-time operations for IoT networks.

Main Methods:

  • Utilizing lattice-based one-way functions with lattice trapdoors.
  • Employing a bad/good basis notion to couple multiple private keys into a single public key.
  • Implementing key establishment, session key update, node addition, encryption, and decryption using linear-algebra operations.

Main Results:

  • A new group key establishment protocol for IoT devices.
  • Conjectured resistance to quantum computer-based attacks.
  • Constant-time operations for all protocol functions, suitable for resource-constrained IoT.
  • Impracticality of node-capture attacks due to on-the-fly key construction.
  • Forward- and backward-secrecy preservation in node addition and key generation.

Conclusions:

  • The proposed lattice-based protocol offers a secure and efficient solution for IoT group communication.
  • The method provides a promising approach to quantum-resistant cryptography in constrained environments.
  • Constant-time operations and robust key management enhance the security and practicality for IoT networks.