A New Quantum Blind Signature Scheme with BB84-State

Area of Science:

• Quantum Cryptography
• Information Security

Background:

• Blind signatures are crucial in cryptography, preventing signers from accessing original messages.
• Quantum blind signatures offer superior unconditional security compared to classical methods.

Purpose of the Study:

• To propose a new, provably secure quantum blind signature scheme.
• To enhance the feasibility and practicability of quantum blind signature implementations.

Main Methods:

• Utilizing non-orthogonal single-photon BB84 states for quantum signature encoding.
• Implementing a message owner process involving a randomizing factor and blind factor stripping.
• Enabling public validation of quantum signatures by a verifier.

Main Results:

• The proposed scheme achieves unconditional security.
• Demonstrated satisfaction of all essential blind signature properties: blindness, unforgeability, non-repudiation, unlinkability, and traceability.
• Elimination of quantum entanglement states improves overall feasibility and practicality.

Conclusions:

• The developed quantum blind signature scheme is provably secure and practical.
• This scheme represents a significant advancement over previous entanglement-based quantum blind signature protocols.
• The method provides a robust and efficient solution for secure quantum communication.