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Optical Engineering

Quantum key distribution via an optical wireless communication link for telephone networks

S. Suchat, W. Khunnam, Preecha P. Yupapin

Published Oct 1, 2007• 41 citations
Publisher

Abstract

We propose a new system of quantum key distribution via optical wireless communication links, where the required information, especially telephone conversation, can be secured by using a quantum code/decode (CODEC) technique incorporated in the networks. The entangled photons can be encoded into the classical information and then the decoded signal can also be retrieved. The proposed system consists of quantum key generation and uplink and downlink parts that can be implemented in the mobile telephone handset and networks. Such a system and technique show the feasibility of use for a perfectly security telephone networks.

DOI
10.1117/1.2786479

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We propose a new system of quantum key distribution via optical wireless communication links, where the required information, especially telephone conversation, can be secured by using a quantum code/decode (CODEC) technique incorporated in the networks. The entangled photons can be encoded into the classical information and then the decoded signal can also be retrieved. The proposed system consists of quantum key generation and uplink and downlink parts that can be implemented in the mobile telephone handset and networks. Such a system and technique show the feasibility of use for a perfectly security telephone networks.
Data encryption/decryption is a very important issue in communication and networks. In the absolute security technique of quantum security, the data are encrypted/decrypted by quantum transported channel. The transported signals are randomly coded/decoded by using the quantum entanglement pairs. The quantum entangle is created by using a single pulse i.e. single photon that occupies the random polarization states, where the required polarization states can be formed by sender and receiver at any time via a quantum channel. In this paper, the single pulse is created by a CW laser diode in the classical Mach-Zehnder interferometer. The single pulse is generated and detected when a light beam is modulated by signal from signal generator with suitable driven frequency on a LiNbO/sub 3/ crystal. Then the entanglement signals can be realized and transmitted via classical optical system. The quantum dense coding can also be performed by the technique of dense wavelength division multiplexing technique, where each transmitted wavelength can be randomly formed entanglement pairs and the dense code/decode schemes use via cable or wireless transmission.
A novel method of quantum key distribution (QKD) based on hybrid fiber-wireless system is proposed in this paper. Quantum key from a center station (i.e., Alice) is transmitted through an optical fiber to a base station and then wirelessly forwarded to mobile nodes (i.e., Bobs). QKD protocol is implemented by using subcarrier intensity modulation, where binary phase shift keying (BPSK) signaling is used for encoding and direct detection with a dual-threshold receiver is employed for decoding. We derive the mathematical expressions for security analysis of the proposed system in terms of quantum bit error rate and ergodic secret-key rate taking into account the channel loss and receiver noise. The feasibility of the proposed QKD system is validated via the numerical results.
Applied Physics Certain conversations or transactions are meant to be private. Yet despite the encryption of digital communication in one form or another, information theory presents a loophole whereby such encrypted messages can be compromised, if only in principle (in practice it may be extremely difficult to do so). Quantum mechanics closes that loophole altogether. Sharing quantum mechanically—entangled photons can provide a secure key with which to encrypt and send a message, safe in the knowledge that the message cannot be opened by an eavesdropper, at least not without alerting you to the breach. Chen et al. demonstrate a quantum key distribution protocol in a real-world application scenario, with the quantum key distributed over a network consisting of three stations linked by 20 km of commercial optical fiber. The generated keys can be used immediately in the context of encrypted real-time telephone conversations between the separated stations. With such a demonstration, quantum privacy in your own home may not be a too distant prospect. Opt. Express 17 , 6540 (2009).
It is well known that wireless networks have become one of the most important part used communication systems, in particular for ubiquitous computing. However, providing secure communication for wireless networks has become one of the prime concerns. Quantum cryptography, namely quantum key distribution (QKD), offers the promise of unconditional security. In this paper, we shall extend our previous research work to a new method of integrating quantum cryptography for key distribution in 802.11 wireless networks. Our contributions, based on our previous results [1], are as follows: (a) We shall show how QKD can be used in IEEE 802.11 wireless networks to securely distribute the keys. (b) We shall introduce a method that take the advantage of mutual authentication features offered by some EAP variants of 802.1X port-based network access control. (c) finally, we present a new code called quantum message integrity code (Q-MIC) which provides mutual authentication between the two communication parties and its implementation.
Wireless networks have become one of the most widely used communication systems in the world. However, providing secure communication for wireless networks has become one of the prime concerns. Quantum cryptography, namely Quantum Key Distribution (QKD), offers the promise of unconditional security. In our paper, we shall extend our previous research work to a new method of integrating quantum cryptography for key distribution in 802.11 wireless networks. Our contributions, based on our previous results [1], are as follows: (1) We shall show how QKD can be used in IEEE 802.11 wireless networks to securely distribute the keys. (2) We shall introduce a method that take the advantage of mutual authentication features offered by some EAP variants of 802.1X Port-Based Network Access Control. (3) Finally, we present a new code called Quantum Message Integrity Code (Q-MIC) which provides mutual authentication between the two communication parties and its implementation
The Wireless communication networks have been increasing their speed at a fast pace while the data sent over unsecured channels has become a major concern due to security issues. The advancement in cryptography techniques is based mainly on computational hardness, which will be endangered as quantum computing technology advances. Quantum Key Distribution (QKD) is a way to share keys in a secure manner based on quantum mechanics principles, which do not allow any kind of unauthorized access. Here we present a wireless communication framework that is secure in nature and makes use of Quantum Key Distribution along with support from Grover’s quantum search algorithm. In particular, the overall system provides generation, distribution, and verification of keys among communicating partners through both quantum channel and classical communication channel security features. Using Grover’s algorithmize one can make key validation more efficient without much increasing computational need for compromising system performance. This will result in high performance systems. This thesis proposed model covers the basic aspects of the techniques, error correction and key sifters. All this together helps to determine a verifiable secret key implementation as a practicable instrument. The system’s performance is simulated in an assesment based evaluation for system security strength, rate of key generation and resistance to eavesdropping threats .This shows that the Security System provides protection against both Classical as well as Quantum Threats and also guarantees efficiency in their communication. The method proposed above is a scalable and future-ready security solutions for the next generation of wireless networks. It does so by contributing to the fortified communication systems in the quantum era and helping develop an enhanced quantum cryptographic system.