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A Private Quantum Bit String Commitment.

Mariana Gama1,2, Paulo Mateus1,2, André Souto1,3

  • 1Instituto de Telecomunicações, 1049-001 Lisbon, Portugal.

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|December 8, 2020
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Summary
This summary is machine-generated.

We introduce a quantum bit string commitment protocol using entanglement, proven composable in the random oracle model. It also protects message privacy, with security maintained over authenticated channels.

Keywords:
composable securityentanglementphysical unclonable functionsprivacyquantum bit commitment

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Area of Science:

  • Quantum information science
  • Cryptography
  • Quantum cryptography

Background:

  • Quantum bit string commitment is crucial for secure cryptographic protocols.
  • Existing protocols face challenges in composability and privacy preservation.
  • Entanglement-based approaches offer potential for enhanced security features.

Purpose of the Study:

  • To propose a novel entanglement-based quantum bit string commitment protocol.
  • To prove the protocol's composability in the random oracle model.
  • To ensure the protocol preserves the privacy of the committed message.

Main Methods:

  • Utilizing quantum entanglement for commitment.
  • Employing the random oracle model for security proofs.
  • Analyzing security against man-in-the-middle attacks.
  • Investigating the use of physical unclonable functions (PUFs) as an alternative.

Main Results:

  • The proposed protocol is proven composable in the random oracle model.
  • The protocol successfully preserves the privacy of the committed message.
  • Security and privacy are maintained over authenticated channels against man-in-the-middle attacks.
  • When using PUFs in the bad PUF model, the protocol is secure and private but not composable.

Conclusions:

  • The entanglement-based quantum bit string commitment protocol offers a secure and private solution.
  • Composability is achieved in the random oracle model, enhancing protocol security.
  • The protocol's resilience against specific attacks can be bolstered through authenticated communication channels.