quantum cryptography


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quantum cryptography

An encryption method that can detect eavesdropping. Using optical transmission to send a secret key to the other side, quantum cryptography draws on the inherent properties of photons, which become slightly altered if they are observed by an intruder. When an alteration is detected, the receiver knows the sender's key has been compromised. See cryptography.

Polarized and Entangled Photons
One method relies on the polarization of the photons, which will be altered if observed (see QKD). Another method uses photon pairs that exhibit a correlation between them. Any observation along the way weakens the correlation, which can be detected.
References in periodicals archive ?
According to market research firm Market Research Media, global quantum cryptography communications will grow into a 26.
Quantum cryptography was proposed by Bennett and Brassard (40) in 1984 as a technology to distribute secure keys by using quantum media.
Niemiec, Design, Construction and Verification of a High-Level Security Protocol Allowing to Apply the Quantum Cryptography in Communication Networks.
Theoretically, a quantum computer would be able to break current encryption systems, but quantum cryptography is arguably unbreakable even by a quantum computer.
However, a theoretical physicist Karl Svozil disagrees that the protocol is entirely secure and said that the protocol required the classical channel to be uncompromised for quantum cryptography to work adding that the newly proposed protocol is 'breakable' by middlemen attacks.
London: Researchers have come up with a way of protecting telecoms networks using quantum cryptography without the need for expensive dedicated optical fibre links.
The requirement of separate fibres has greatly restricted the applications of quantum cryptography in the past, as unused fibres are not always available for sending the single photons, and even when they are, can be prohibitively expensive," said Andrew Shields from Toshiba Research in Cambridge.
With quantum cryptography, a quantum cryptographic key is transmitted one photon at a time, the smallest increment possible.
The world's first commercial quantum cryptography solution was QPN Security Gateway (QPN-8505) proposed by MagiQ Technologies (USA) (QPN .
Born theoretically just a quarter century ago, quantum cryptography forms the foundation of a burgeoning research enterprise known as quantum information theory, which involves not just quantum communication but also the ambitious goal of quantum computation.
First, they are part of a multi-team effort with NIST to build a compact robust entangled photon source for use in quantum cryptography.
This paper explains how cryptography will be benefited from quantum mechanics, through a short introduction to classical cryptography, and the general principles of quantum cryptography and the BB84 protocol for key distribution.