Abstract In response to information security issues present in quantum information query scenarios, this paper proposes a quantum information query scheme based on quantum digital signatures. This scheme addresses the security vulnerabilities of existing quantum queries lacking strong authentication, trusted behavior binding, and unified access controllers. Using key-controlled single particle rotation operations, the user identity is jointly encoded with the query information into a quantum state constitutive signature and sent to the access controller, constructing a physically inseparable signature binding. The access controller uses hash verification to verify the legitimacy of the identity before forwarding the signature state. The verifier restores the query information parameters through reverse rotation and Bell measurements and completes the final verification, ensuring that the query behavior is demonstrable, non-falsifiable, and irrefutable throughout the process. The scheme requires only local single-particle operations throughout the process, while significantly reducing the complexity of implementation. It integrates privacy protection, identity authentication, and signature security into an organic whole, forming a trusted security closed loop of quantum information queries supported by a trusted access controller at the core.
Abstract In response to information security issues present in quantum information query scenarios, this paper proposes a quantum information query scheme based on quantum digital signatures. This scheme addresses the security vulnerabilities of existing quantum queries lacking strong authentication, trusted behavior binding, and unified access controllers. Using key-controlled single particle rotation operations, the user identity is jointly encoded with the query information into a quantum state constitutive signature and sent to the access controller, constructing a physically inseparable signature binding. The access controller uses hash verification to verify the legitimacy of the identity before forwarding the signature state. The verifier restores the query information parameters through reverse rotation and Bell measurements and completes the final verification, ensuring that the query behavior is demonstrable, non-falsifiable, and irrefutable throughout the process. The scheme requires only local single-particle operations throughout the process, while significantly reducing the complexity of implementation. It integrates privacy protection, identity authentication, and signature security into an organic whole, forming a trusted security closed loop of quantum information queries supported by a trusted access controller at the core.
With the deep penetration and iteration of network technology, the realization of secure and controlled information query is related to the confidentiality, integrity and availability of data resources. In this paper, a quantum information query scheme based on quantum teleportation is proposed by combining quantum teleportation and information query. In this scheme, the user transmits the query information while performing two-way authentication with the access controller to verify the legitimacy of the user, and then the information is sent to the data processing center using quantum teleportation and the correctness of the signature is verified, and then the system performs the retrieval operation. The scheme is characterized as follows: synchronization of authentication and encryption is achieved by integrating the authentication bits and encrypted information bits into the same quantum sequence by using bi-directional authentication in non-orthogonal states and bit-folding techniques; By implementing localized unitary operations on the shared EPR entangled states, the verification information is encoded in the quantum correlation properties between particles, forming a novel communication architecture for transmitting information through particles invisibly; The security analysis shows that the scheme is non-forgeable, non-repudiation and traceable, as well as resistant to intercept-retransmit attacks and Denial-Of-Service (DOS) attacks.
Quantum digital signatures (QDS) establish a framework for information-theoretically secure authentication in quantum networks. As a specialized extension of QDS, quantum proxy signatures facilitate secure delegation of signing privileges in distributed quantum environments. However, existing schemes require the predefinition of verifier identities at the system setup phase, which fundamentally constrains their deployment in real-world scenarios. To address this constraint, we propose a quantum proxy signature scheme supporting verification by arbitrary parties without pre-registration while maintaining information-theoretic security guarantees. This work presents a constructive approach to mitigating verification constraints in quantum proxy signature architectures.
Traditional digital signatures are based on mathematical hard problems that are vulnerable to quantum attacks. For privacy-sensitive applications such as electronic cash and electronic voting, partially blind signatures are preferable because they protect private messages while allowing signers to verify necessary public information. This paper proposes an identity-based quantum partially blind signature scheme based on quantum teleportation. Each signing session is assigned a unique identifier. The user blinds the private binary message by applying Pauli-X operations with a one-time random string, while public information remains visible to the signer. A trusted PKG performs identity authentication, signature authorization, session-key distribution, and time-period-based key lifecycle management. Quantum tags and quantum authentication codes provide verification and arbitration evidence, while quantum teleportation is used to transmit quantum information. In case of disputes, an arbitrator can verify independently stored quantum evidence, and channel monitoring enables the detection of eavesdropping and tampering. Security analysis shows that the proposed scheme satisfies partial blindness, unforgeability, and non-repudiation, and resists malicious third-party attacks. It is suitable for privacy-preserving and restricted-authorization applications such as electronic cash and electronic voting.
In recent years, identity-based quantum signature protocols have received much attention due to their unique advantages. Based on Bell states, we propose an efficient identity-based quantum signature scheme. In our scheme, the signer’s private key is generated from their identity information. The signer uses the private key and secret parameters to generate a signature for the verifier. The verifier, who possesses the identity information of the signer, can authenticate the signature. Our proposed scheme ensures signature non-forgeability and non-repudiation. In addition, the protocol does not require the preparation of long-term quantum memory or the performance of quantum swap tests, making it more efficient than previous schemes.
operators, a new quantum signature scheme is proposed. In our scheme, the signer's private key is generated by a trusted private key generator (PKG), while the identity information of the signer is used as the corresponding public key. Both of the private key and public key of the signer are classical bit strings, which can be easily stored and reused. Given a quantum signature, anyone can verify the validity of the quantum signature with the signer's identity. Therefore, our scheme is a public-key quantum signature without a digital certificate, which has the merits of an identity-based cryptosystem and can simplify the key management of the quantum signature system. On the other hand, our scheme need not use any quantum swap test during the signature verification phase. Furthermore, by the signature proof, our scheme can arbitrate the potential disputation of losing quantum signature, which cannot be arbitrated in most of the quantum signature schemes. So our scheme has the property of strong non-repudiation. It also has the security properties of information-theoretic security, unforgeability, etc. Our scheme can achieve a high efficiency of 70%. Therefore, our quantum signature scheme is more secure, practicable, and efficient than the similar schemes.
Abstract Quantum Designated Verifier Signature (QDVS) is a cryptographic scheme based on quantum mechanics in which a signature can be verified only by a specific designated verifier. Recently, Xin et al. (Quantum Information Processing, 2020, 19(3):79) proposed a QDVS scheme based on Bell states and claimed that it was secure. However, we demonstrate that their scheme is vulnerable to forgery attacks. To overcome this vulnerability, we propose an improved QDVS scheme utilizing single qubits and unitary operations. Compared with Xin et al.'s scheme, our scheme requires neither a trusted center (TC) nor quantum entanglement resources, thereby greatly reducing the implementation complexity. Our security analysis demonstrates that our scheme can resist common attacks, including inter-resending, forgery, and impersonation attacks.