Quantum signature scheme based on Hadamard and H_π/4 operators

Area of Science:

• Quantum Information Science
• Cryptography
• Computer Science

Background:

• Traditional quantum signature schemes often face challenges with key management and lack robust dispute arbitration.
• Existing identity-based cryptosystems offer simplified key management but may not fully leverage quantum security properties.

Purpose of the Study:

• To propose a new public-key quantum signature scheme based on Hadamard and H_π/4 operators.
• To develop a scheme that simplifies key management and enhances security features like non-repudiation.

Main Methods:

• Utilizing Hadamard and H_π/4 operators for quantum signature generation.
• Implementing an identity-based approach where signer identity serves as the public key.
• Ensuring verification without quantum swap tests and incorporating signature proof for dispute arbitration.

Main Results:

• The proposed scheme functions as a public-key quantum signature without digital certificates, integrating identity-based cryptosystem merits.
• Achieved strong non-repudiation through signature proof for dispute resolution.
• Demonstrated information-theoretic security, unforgeability, and a high efficiency of 70%.

Conclusions:

• The new quantum signature scheme offers improved security, practicality, and efficiency compared to similar existing schemes.
• The identity-based framework simplifies key management in quantum signature systems.
• The scheme provides robust dispute arbitration and strong non-repudiation, addressing limitations in current quantum signature protocols.