Improve security of quantum cryptography

Yi Liu, Xingtong Liu, Jian Wang +2 more

Electronic payment protocols play a vital role in electronic commerce to ensure the security of transaction process. Current electronic payment protocols based on complex mathematical problems will be vulnerable facing a quantum computer. In order to enhance the security against quantum computers, quantum cryptography is introduced into electronic payment protocols. Although the quantum cryptography is claimed to be unconditionally secure, Logical defects are still likely to cause serious problems. We introduced formal analysis to verify the security of electronic payment protocols based on quantum cryptography. Formal analysis methods can discover the vulnerabilities of protocols and help to improve the security of protocols. In this paper, we analyze an electronic payment protocol based on quantum cryptography and the result shows that the protocol is not secure even adopting unconditionally secure quantum cryptography. We found that both the accountability and fairness of the original protocol are not satisfied. Then we proposed an improved protocol to meet the requirement of accountability and fairness and verified it through formal analysis method.

Anindita Banerjee

Eleni Diamanti

Y. J. Lu, Luobei Zhu, Z. Y. Ou

Weak coherent states as a photon source for quantum cryptography have a limit in secure data rate and transmission distance because of the presence of multiphoton events and loss in transmission line. Two-photon events in a coherent state can be taken out by a two-photon interference scheme. We investigate the security issue of utilizing this modified coherent state in quantum cryptography. A 4-dB improvement in the secure data rate or a nearly twofold increase in transmission distance over the coherent state are found. With a recently proposed and improved encoding strategy, further improvement is possible.

Thota Venkat Narayana Rao, Maithreyi Simhachalam, Smitha Bandyala +1 more

Sharmeen Kaur, Raveena Singh, Shivya Gagneja

Network Security is the most vital component in data protection because it is responsible for protecting all information passed through computers containing network. Network Security refers to all hardware and software functions, characteristics, features, accountability, measures, access control, and administrative and management policy required to provide an acceptable level of protection for Hardware and Software, and information in a network. Here we are focusing on the technique of Quantum Cryptography which uses the law of quantum physics for unconditionally secure data communications. This is an improvement because the cryptography currently in use, known as conventional cryptography, is dependent entirely on the difficulty level of a mathematical equation. To write this paper we have studied about Network Security and methods of encoding and decoding in detail. Hereby we are presenting our work on the enhancement of cryptography using various encoding and decoding approaches. The proposed algorithm has a better speed compared with other encoding algorithm. Nevertheless, the proposed algorithm improves encoding security by inserting the symmetric layer. The proposed algorithm will be useful to the applications which require the same procedure of encoding and decoding. This paper makes a comparison between classical cryptography and quantum cryptography and outlines the increased security level provided by quantum cryptography.