Quantum Encoder and Decoder for Secret Key Distribution with Check Bits

T Godhavari,N.R Alamelu

doi:10.19026/rjaset.6.3440

Abstract

The focus of this study is to develop a novel method of encoding the qubits and use as secret key in public key cryptography. In BB 84 protocol, 50% of the random number (generated at source) is used as secret key and the remaining bits are used as “check bits”. The check bits are used to detect the presence of eve as well as the nature of quantum channels. In this protocol, random qubits are encoded using different type of polarizations like horizontal, veritical and diagonal. In the proposed quantum encoder, basic quantum gates are used to encode the random secret key along with the check bits. Quantum key distribution, (a cryptographic mechanism) relies on the inherent randomness of quantum mechanics and serves as an option to replace techniques made vulnerable by quantum computing. However, it is still subject to clever forms of eavesdropping and poses a significant challenge to implementation. To study the challenges, quantum circuits are first simulated using QCAD.

Highlights

Promising advances in the field of quantum computing indicate a growing threat to cryptographic protocols based on integer factorization
Quantum Key Distribution (QKD) is one of the innovative methods of information processing that emerged from the properties of quantum mechanics
Wang et al (2006) proposed a QSDC protocol that uses single photons, of which the concepts were resulted from the order rearrangement and the block transmission of the photons, Cederlof and Larson (2008) analyze security effects of using a key obtained from Quantum Cryptography (QC) for authentication purposes

Summary

INTRODUCTION

Promising advances in the field of quantum computing indicate a growing threat to cryptographic protocols based on integer factorization. To counter this threat, researchers have already designed and tested alternative protocols that do not rely on factorization (Paterson et al, 2004). Quantum information processing a field that includes quantum computing, quantum cryptography and quantum communication. Quantum communications offers many advantages for secure data transmission by encoding the information in quantum bits (qubits), using its intrinsic physical properties, such as polarization of a photon. Quantum Key Distribution (QKD) is one of the innovative methods of information processing that emerged from the properties of quantum mechanics

LITERATURE REVIEW

Qubit Vector

SIMULATION RESULTS

CONCLUSION AND FUTURE SCOPE