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Cryptanalysis of efficient controlled semi-quantum secret sharing protocol with entangled state.

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This study reveals security flaws in a recent quantum secret sharing protocol. The controller can access the secret, and attackers can introduce undetected errors, compromising data integrity and confidentiality.

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Area of Science:

  • Quantum Cryptography
  • Information Security

Background:

  • Quantum secret sharing is crucial for secure key management and multiparty computation.
  • Recent advancements include controlled semi-quantum secret sharing protocols using entangled states.

Purpose of the Study:

  • To perform a cryptanalysis of an efficient controlled semi-quantum secret sharing protocol.
  • To identify vulnerabilities and assess the protocol's security guarantees.

Main Methods:

  • Cryptanalysis of the proposed protocol.
  • Simulation of attack scenarios, including collusion and denial-of-service.

Main Results:

  • The controller can collude with a single participant to recover the secret.
  • An external adversary can inject undetected errors (false secrets) via denial-of-service attacks.

Conclusions:

  • The protocol fails to meet essential security requirements.
  • It does not ensure that unauthorized parties gain no information about the secret.
  • The protocol's correctness cannot be guaranteed against the identified attacks.