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Journal of Southwest University

An Improved Scheme of B92 Protocol and Digital Signature

Bao Xiao-min

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

An improvement of B92 quantum key distribution protocol is proposed in this paper.The main idea is to find secret listeners more easily from a trap of the quantum channel by some false basis the sender has inserted.Based on the quantum key distribution protocol of B92 and the RSA public-key cipher system,a new dual safekeeping and mutually authenticated digital signature scheme is constructed.

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•Jan 1, 2012•0 citations
An improvement of B92 quantum key distribution protocol is proposed in this paper.The main idea is to find secret listeners more easily from a trap of the quantum channel by some false basis the sender has inserted.Based on the quantum key distribution protocol of B92 and the RSA public-key cipher system,a new dual safekeeping and mutually authenticated digital signature scheme is constructed.
Based on the quantum key distribution protocol of BB84 and elliptic curve cryptography,a new digital signature scheme was proposed.This project used the quantum key as conversation key to make the signature process be highly effective and simple.The certifiable security of this conversation key in the key distribution process combined with the elliptic curve encryption system has provided the dual safekeeping of security to the new scheme and simultaneously achieved mutually authenticated effect.
In order to solve the low key distribution efficiency problem of the BB84 protocol, an improved BB84 quantum key distribution scheme is presented in this paper. Firstly the same polarization basis is used by the sender and the receiver with the consistent agreement. This process could make quantum key distribution rate higher. Then signature combined with the error correction method based on the odd and even parity is used to ensure the safety of the transmission. The analyses results indicate that the advantage of the improved scheme lies in that the all photons sent to Bob by Alice are useful. It can not only reduce the time extracting the original key, but also solve the authentication problem in the process of communication. The key distribution efficiency is two times of the original BB84 protocol improved scheme.
Advances in quantum computer technology are threatening cryptographic systems based on mathematical complexity. As an alternative, quantum cryptography has been proposed and developed. Among the reported quantum cryptography systems, quantum key distribution (QKD) constitutes a symmetric key system that can securely distribute a secret key on a quantum channel. While there have been many studies on confidential communication using QKD, only a few of them address its application to the digital signature. In this paper, we propose a new digital signature method with public parameter and signature key through shared symmetric key from QKD. We also analyze the proposed plan from security.
We present a quantum digital signature scheme whose security is based on fundamental principles of quantum physics. It allows a sender (Alice) to sign a message in such a way that the signature can be validated by a number of different people, and all will agree either that the message came from Alice or that it has been tampered with. To accomplish this task, each recipient of the message must have a copy of Alice's "public key," which is a set of quantum states whose exact identity is known only to Alice. Quantum public keys are more difficult to deal with than classical public keys: for instance, only a limited number of copies can be in circulation, or the scheme becomes insecure. However, in exchange for this price, we achieve unconditionally secure digital signatures. Sending an m-bit message uses up O(m) quantum bits for each recipient of the public key. We briefly discuss how to securely distribute quantum public keys, and show the signature scheme is absolutely secure using one method of key distribution. The protocol provides a model for importing the ideas of classical public key cryptography into the quantum world.
Even though there have been various proposed and wideley used ciphering techniques in cryptography, main improvements in this field came out with the idea of “super computing”. Till now, popular methods like DES, AES and RSA which can be mathematically cracked in a duration of universe’s age, have been proposed. But all of these methods’s future is at risk because of the studies in production of “Quantum Computer”s of which computation speed is estimated to be very high so that no other existing super computers compete with them. At this stage, by using quantum mechanics a new method called “Quantum Key Distribution” and its protocols for the process of building cipher key, are proposed instead of determining new mathematical solutions for securing the data. In this study, a simulation project based on previously proposed Quantum Key Distribution protocols BB84 and B92, will be explained. At the end of the project by using BB84 and B92 protocols, a comparison of quantum bit error rates and detection rates of eavesdropping according to protocols, is done and results are obtained.
In this paper, a key distribution protocol based on the integration of both classical and quantum cryptography is developed. Quantum cryptography is used for secure optical transmission which employs quantum mechanisms to distribute session keys. Classical cryptography provides convenient techniques that enable efficient user authentication and prevent denial of previous commitments. The proposed scheme is based on the RSA-TBOS signcryption scheme to achieve the combined functionality of a digital signature and encryption in an efficient manner. The transmitter generates a random session key, and applies the signcryption module to it. It therefore offers three services: privacy, authenticity and non-repudiation. The ciphertext is converted to binary bits then to qubits using a pre-shared random number between the transmitter and receiver. The session key is used later for secure transmission of messages over a public optical channel.