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Nec Research & Development

Introduction of quantum cryptography and its development : Quantum information technology

Yoshihiro Nambu, Hideo Kosaka

Published Jul 1, 2003• 2 citations
OpenAlex

Abstract

Quantum cryptography provides us with a method for two remote users to communicate in an unconditionally secure way. In this paper, we present a brief introduction of this new technique and activities in our laboratory to develop a practical cryptographic system using photonic technologies.

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Quantum cryptography is the art and science of exploiting quantum mechanical propertie s to perform cryptographic tasks. It is a technology that ensures ultimate security. Compared to current cryptography that could be defeated by the development of an ultra high-speed computer, quantum cryptography ensures secure communication because it is based on the fundamental physical laws. It is an emerging technology in which two parties may simultaneously generate shared, secret cryptographic key material using the transmission of quantum states of light. Quantum cryptography is a new method for sec ret communications offering the ultimate security assurance of the inviolability of a Law of Nature. The quantum cryptography relies on two important elements of quantum mechanics -the Heisenberg Uncertainty principle and the principle of photon polarization.
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In the era of information technology the need for secure communication has become increasingly important. Cryptography is a technology for creating the core of information security we use cryptography for making data secure which is the science of information protection from unauthorized interception and tempering. Most modern cryptographic studies design cryptosystems and algorithms using mathematical concepts which are based either on factorization or on discrete logarithm problem. In recent years quantum information research has lead to the discovery of a number of remarkable new paradigms for information processing and communication. These developments include quantum cryptography schemes that offer unconditionally secure information transport guaranteed by quantum-mechanical laws, which provide protection of system security, and optimization of system efficiency and detects intrusion and wiretap. Today quantum cryptography is used in various application for transferring secure data without the fear of keys being compromised. This paper reviews the various areas where quantum  cryptography is successfully implemented, its advantages disadvantages & technical issues.
Quantum Cryptography is a novel approach to make the information and network world more secure. Unlike classical cryptography, quantum cryptography ensures the security of communication because it is based on the laws of Quantum Mechanics; a branch of physics that deals with the fundamental behavior of matter and their energies to the levels of subatomic particles. These particles and their intrinsic properties such as photon polarization and entanglement allow us to develop an unbreakable system of cryptographic information. Conventionally, the security has been primarily concerned with the secured distribution of secret key carried over an insecure channel. However, in Quantum Cryptographic systems the transmission of secret key is done using aforementioned laws of nature through a secured quantum channel highly susceptible to intrusion detection. Consequently, the Quantum Key Distribution (QKD), in conjunction with protocols such as BB84 protocol has emerged as an ultimate modern secured communication system. This article concentrates on briefly reviewing quantum cryptography, some recent developments and reports of its vulnerabilities.