A novel quantum ring signature scheme without using entangled states

Satyam Omar, Namita Tiwari, Sahadeo Padhye

Tianyuan Zhang, Xiangjun Xin, Lei Sun +2 more

Chi Qiu, Shibin Zhang, Yan Zuo Chang +2 more

Guang‐Bao Xu, Kejia Zhang

Xingjia Wei, Dianjun Lu, Shuangshuang Luo +1 more

Quantum signature has become a hot topic in the current research of digital signature schemes due to its unconditional security. As a special kind of digital signature, ring signatures are frequently employed in practical situations because of their superior anonymity. In this work, we propose a quantum ring signature scheme based on secret sharing that does not use entanglement states. To guarantee the complete security of the participants’ secret keys, the idea of secret sharing is incorporated into the quantum key distribution process during the key distribution stage. Each ring member contributes his private key share to the final verification formula through a recursive relationship throughout the signing and verification phases, and the verifier can utilize his private key share along with the user’s public key to confirm the ring members’ authenticity; The [Formula: see text]-AS2U hash function is used to encrypt the ring signer’s identity during the entire signature process, which assures the signer’s identity’s complete anonymity, effectively protects the signer’s privacy, and is more in line with practical requirements.

Sihai Liu, Rongbo Lu, Kai Xing

This paper proposes a quantum ring blind signature scheme with revocable anonymity. In this scheme, the message holder blinds the quantum state message through the quantum revolving gate to ensure blindness, the signer uses the random number calculation to compute the generated commitment combined with the quantum revolving gate to obtain the quantum state signature, and the verifier verifies the validity of the signature through the SWAP test. The scheme introduces revocable tags maintained by trusted third parties, which can trace the identity of the signer when necessary, achieving conditional anonymity of signatures. Under the quantum stochastic oracle model, the analysis proves that it meets the requirements of unforgeability and anonymity. Compared with the existing scheme, this scheme integrates ring signatures, blind signatures, and revocable anonymity for the first time under the quantum framework, achieving a balance between privacy protection and compliance supervision.