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International Journal of Modern Physics B

PARTIALLY BLIND SIGNATURES BASED ON QUANTUM CRYPTOGRAPHY

Xiao‐Qiu Cai, HUI-FANG NIU

Published Oct 7, 2012• 11 citations
Publisher

Abstract

In a partially blind signature scheme, the signer explicitly includes pre-agreed common information in the blind signature, which can improve the availability and performance. We present a new partially blind signature scheme based on fundamental properties of quantum mechanics. In addition, we analyze the security of this scheme, and show it is not possible to forge valid partially blind signatures. Moreover, the comparisons between this scheme and those based on public-key cryptography are also discussed.

DOI
10.1142/s0217979212501639

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In a partially blind signature scheme, the signer explicitly includes pre-agreed common information in the blind signature, which can improve the availability and performance. We present a new partially blind signature scheme based on fundamental properties of quantum mechanics. In addition, we analyze the security of this scheme, and show it is not possible to forge valid partially blind signatures. Moreover, the comparisons between this scheme and those based on public-key cryptography are also discussed.
In a quantum partially blind signature (QPBS) scheme, the contradiction between anonymity and controllability of completely blind signature (BS) schemes was better solved by adding common negotiated public information between the signer and the requester (the message holder). After reviewing the proposed scheme, we give an analysis about it and then propose a novel QPBS scheme without entanglement. The security without preconditions of this signature scheme is ensured by the secure quantum key distribution (QKD) protocol and quantum one-time pad (QOTP). Furthermore, in the process of security analysis, it proves that our scheme satisfies the foundational attribution of partially blind signature (PBS). Moreover, the scheme can solve the problem we put forward so as to allow it to have a wider application in the future.
The paper uses the uncertainty principle and nocloning theorem; then combines the fundamental properties of quantum mechanics with the cryptographic hash function together; after that proposes a new security quantum blind signature.The analysis of security shows that the improved scheme has the feature of non-forgery, non-disavowal.Compares with other quantum signature, the new scheme needn't to update the signer's transmission private key and it can avoid the signer's private key being exposed by the sender.Moreover, the improved scheme has guiding significance value to further optimal design quantum blind signature and quantum signature, etc.
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.
The blind signature is widely used in cryptography applications because it can prevent the signer from gaining the original message. Owing to the unconditional security, the quantum blind signature is more advantageous than the classical one. In this paper, we propose a new provable secure quantum blind signature scheme with the nonorthogonal single-photon BB84-state and provide a new method to encode classical messages into quantum signature states. The message owner injects a randomizing factor into the original message and then strips the blind factor from the quantum blind signature signed by the blind signer. The verifier can validate the quantum signature and announce it publicly. At last, the analytical results show that the proposed scheme satisfies all of the security requirements of the blind signature: blindness, unforgeability, non-repudiation, unlinkability, and traceability. Due to there being no use of quantum entanglement states, the total feasibility and practicability of the scheme are obviously better than the previous ones.
Abstract With the continuous development of quantum technology, the quantum signature as an application of quantum cryptography has received great attention. In this paper, we propose a public-key quantum group blind signature scheme based on single-qubit rotations. In this scheme, the group manager generates a public key. Each group member randomly generates his own private key according to the public key. The signer uses his private key and random sequence to generate the signature. The verifier uses the public key to verify the correctness of the quantum signature. The public and private keys can be reused, which simplifies the key management of the signature system. In this scheme, the random sequence is used to enhance the security of the scheme. At the same time, the quantum efficiency is improved by using single-qubit rotations. The security analysis shows that our scheme can ensure the security of the keys, the unforgeability and the non-deniability of the signature.