HK113097A - System and method for key distribution using quantum cryptography - Google Patents

System and method for key distribution using quantum cryptography

Info

Publication number
HK113097A
HK113097A HK113097A HK113097A HK113097A HK 113097 A HK113097 A HK 113097A HK 113097 A HK113097 A HK 113097A HK 113097 A HK113097 A HK 113097A HK 113097 A HK113097 A HK 113097A
Authority
HK
Hong Kong
Prior art keywords
key distribution
quantum cryptography
cryptography
quantum
key
Prior art date
Application number
HK113097A
Other languages
English (en)
Inventor
Paul David Townsend
Original Assignee
British Telecomm
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB929226995A external-priority patent/GB9226995D0/en
Application filed by British Telecomm filed Critical British Telecomm
Publication of HK113097A publication Critical patent/HK113097A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0852—Quantum cryptography
    • H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
HK113097A 1992-12-24 1997-06-26 System and method for key distribution using quantum cryptography HK113097A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB929226995A GB9226995D0 (en) 1992-12-24 1992-12-24 Communications system
EP93307121 1993-09-09
EP93307120 1993-09-09
PCT/GB1993/002637 WO1994015422A1 (en) 1992-12-24 1993-12-23 System and method for key distribution using quantum cryptography

Publications (1)

Publication Number Publication Date
HK113097A true HK113097A (en) 1997-08-29

Family

ID=27235488

Family Applications (1)

Application Number Title Priority Date Filing Date
HK113097A HK113097A (en) 1992-12-24 1997-06-26 System and method for key distribution using quantum cryptography

Country Status (9)

Country Link
US (1) US5675648A (xx)
EP (1) EP0676110B1 (xx)
JP (1) JPH08505019A (xx)
AU (1) AU674198B2 (xx)
CA (1) CA2152628C (xx)
DE (1) DE69309496T2 (xx)
ES (1) ES2101495T3 (xx)
HK (1) HK113097A (xx)
WO (1) WO1994015422A1 (xx)

Families Citing this family (135)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2169553C (en) * 1993-09-09 1999-12-07 Paul David Townsend System and method for key distribution using quantum cryptography
EP0717897B1 (en) * 1993-09-09 1998-01-21 British Telecommunication Public Limited Company System and method for quantum cryptography
ES2126143T3 (es) * 1993-09-09 1999-03-16 British Telecomm Distribucion de claves en una red de acceso multiple mediante criptografia cuantica.
WO1996007951A1 (en) * 1994-09-08 1996-03-14 British Telecommunications Plc Polarisation modulation
US5953421A (en) * 1995-08-16 1999-09-14 British Telecommunications Public Limited Company Quantum cryptography
AU2333597A (en) * 1996-03-19 1997-10-10 Richard A. Steenblik Controlling correlated quantum state probability distributions
WO1998010560A1 (en) * 1996-09-05 1998-03-12 Swisscom Ag Quantum cryptography device and method
FR2763193B1 (fr) * 1997-05-06 1999-06-18 France Telecom Procede et dispositif de distribution quantique de cle de cryptage
US6314189B1 (en) * 1997-10-02 2001-11-06 Akio Motoyoshi Method and apparatus for quantum communication
US6188768B1 (en) 1998-03-31 2001-02-13 International Business Machines Corporation Autocompensating quantum cryptographic key distribution system based on polarization splitting of light
US6289104B1 (en) * 1998-08-07 2001-09-11 Ilinois Institute Of Technology Free-space quantum cryptography system
JP4038783B2 (ja) * 1998-09-24 2008-01-30 独立行政法人科学技術振興機構 量子暗号通信システム及び量子暗号通信方法
FR2786345B1 (fr) * 1998-11-24 2001-02-09 Thomson Csf Dispositif de cryptage quantique
GB2361058B (en) * 1999-03-17 2002-03-20 British Telecomm Detection system
JP4107761B2 (ja) 1999-04-12 2008-06-25 三菱電機株式会社 光子数状態発生装置
JP4028658B2 (ja) * 1999-04-12 2007-12-26 三菱電機株式会社 単一光子発生装置
US6678379B1 (en) * 1999-06-18 2004-01-13 Nec Corporation Quantum key distribution method and apparatus
AU1568301A (en) * 1999-06-30 2001-02-05 University Of Maryland System and method for optical wireless communication
US7106971B1 (en) 1999-06-30 2006-09-12 University Of Maryland System and method for optical wireless communication
DE10009209A1 (de) * 2000-02-26 2001-09-06 Deutsche Telekom Ag Vorrichtung zur Erzeugung, Addition und Subtraktion digitaler Folgen optischer Pulse und Verfahren zur sicheren Übertragung von Nachrichten
FR2806171B1 (fr) 2000-03-10 2002-06-14 France Telecom Source a peu de photons commandable
US6895091B1 (en) 2000-07-07 2005-05-17 Verizon Corporate Services Group Inc. Systems and methods for encryption key archival and auditing in a quantum-cryptographic communications network
US7324647B1 (en) 2000-10-23 2008-01-29 Bbn Technologies Corp. Quantum cryptographic key distribution networks with untrusted switches
GB2379847B (en) * 2000-10-25 2003-09-10 Toshiba Res Europ Ltd Encoding,decoding and communication method and apparatus
FR2816780B1 (fr) * 2000-11-10 2003-01-31 Thomson Csf Procede et systeme de transmission par cryptographie quantique
FR2816779B1 (fr) * 2000-11-10 2003-03-07 Thomson Csf Procede et systeme de transmission par cryptographie quantique
JP2002281029A (ja) * 2001-03-21 2002-09-27 Japan Science & Technology Corp 量子暗号通信システム
AU2002255801A1 (en) * 2001-04-11 2002-10-28 Magiq Technologies, Inc. Polarization to phase converter
US7184555B2 (en) * 2001-04-11 2007-02-27 Magiq Technologies, Inc. Quantum computation
US6766070B2 (en) * 2001-04-27 2004-07-20 The United States Of America As Represented By The Secretary Of The Navy High power fiber optic modulator system and method
US7415114B2 (en) * 2001-05-01 2008-08-19 Magiq Technologies, Inc. Quantum key system and method
US7113967B2 (en) 2001-05-29 2006-09-26 Magiq Technologies, Inc Efficient quantum computing operations
JP2003018144A (ja) * 2001-06-29 2003-01-17 Nec Corp 量子暗号多ノードネットワーク及び多ノードネットワーク上の鍵配布方法及び量子暗号装置
US7068790B1 (en) * 2001-08-31 2006-06-27 Bbn Technologies Corp. Systems and methods for path set-up in a quantum key distribution network
JP2004032679A (ja) * 2002-02-28 2004-01-29 Matsushita Electric Ind Co Ltd 通信装置及び通信システム
JP2004030882A (ja) * 2002-04-30 2004-01-29 Toshiba Corp レンダリング装置、コピー制御方法及びプログラム
GB2392063B (en) 2002-05-31 2005-06-22 Corning Inc Method and apparatus for use in encrypted communications
US7403623B2 (en) * 2002-07-05 2008-07-22 Universite Libre De Bruxelles High-rate quantum key distribution scheme relying on continuously phase and amplitude-modulated coherent light pulses
US7274791B2 (en) * 2002-07-15 2007-09-25 Lucent Technologies Inc. Quantum cryptographic system and method for achieving unambiguous state discrimination measurement of coherent light states
US7457416B1 (en) 2002-07-17 2008-11-25 Bbn Technologies Corp. Key distribution center for quantum cryptographic key distribution networks
US7333611B1 (en) * 2002-09-27 2008-02-19 Northwestern University Ultra-secure, ultra-efficient cryptographic system
US7627126B1 (en) 2002-10-15 2009-12-01 Bbn Technologies Corp. Systems and methods for implementing path length control for quantum cryptographic systems
JP4173422B2 (ja) * 2002-12-04 2008-10-29 日本電信電話株式会社 量子鍵配送方法及び量子鍵配送システム
US7460670B1 (en) 2002-12-20 2008-12-02 Bbn Technologies Corp. Systems and methods for managing quantum cryptographic networks
US7236597B2 (en) * 2002-12-20 2007-06-26 Bbn Technologies Corp. Key transport in quantum cryptographic networks
US7227955B2 (en) * 2003-02-07 2007-06-05 Magiq Technologies, Inc. Single-photon watch dog detector for folded quantum key distribution system
US20060018475A1 (en) * 2003-02-07 2006-01-26 Magiq Technologies, Inc. Kd systems with robust timing
US20040184615A1 (en) * 2003-03-21 2004-09-23 Elliott Brig Barnum Systems and methods for arbitrating quantum cryptographic shared secrets
US7706535B1 (en) 2003-03-21 2010-04-27 Bbn Technologies Corp. Systems and methods for implementing routing protocols and algorithms for quantum cryptographic key transport
US7512242B2 (en) * 2003-03-21 2009-03-31 Bbn Technologies Corp. Systems and methods for quantum cryptographic key transport
US7430295B1 (en) 2003-03-21 2008-09-30 Bbn Technologies Corp. Simple untrusted network for quantum cryptography
US7113598B2 (en) * 2003-05-14 2006-09-26 Science Research Laboratory, Inc. Methods and systems for high-data-rate quantum cryptography
GB2404103B (en) * 2003-07-15 2005-06-29 Toshiba Res Europ Ltd A quantum communication system
US7536012B1 (en) 2003-08-06 2009-05-19 The United States Of America As Represented By The Secretary Of The Army Entangled quantum communications and quantum imaging
US7847234B2 (en) 2003-08-06 2010-12-07 The United States Of America As Represented By The Secretary Of The Army Method and system for observing a subject at a first location based upon quantum properties measured at a second location
US8242428B2 (en) * 2007-12-06 2012-08-14 The United States Of America As Represented By The Secretary Of The Army Method and system for lidar using spatial information from a light source in combination with nonspatial information influenced by the subject to derive an image
GB2405294B (en) * 2003-08-18 2006-08-09 Toshiba Res Europ Ltd A quantum communication system and a receiver for a quantum communication system
JP4632652B2 (ja) 2003-10-10 2011-02-16 日本電気株式会社 量子暗号鍵配布システム及びそれに用いる同期方法
US7409162B2 (en) * 2003-10-30 2008-08-05 Magiq Technologies, Inc Timing error reduction in QKD systems
WO2005057927A1 (en) * 2003-11-13 2005-06-23 Magiq Technologies, Inc Qkd with classical bit encryption
US7606371B2 (en) * 2003-12-22 2009-10-20 Magiq Technologies, Inc. Two-way QKD system with active compensation
US20050175183A1 (en) * 2004-02-09 2005-08-11 Shlomo Ovadia Method and architecture for secure transmission of data within optical switched networks
US20050177749A1 (en) * 2004-02-09 2005-08-11 Shlomo Ovadia Method and architecture for security key generation and distribution within optical switched networks
JP4304298B2 (ja) 2004-02-13 2009-07-29 日本電気株式会社 通信システム及びその同期方法
JP4748329B2 (ja) * 2004-02-13 2011-08-17 日本電気株式会社 通信システム及びその同期方法
US7515716B1 (en) 2004-02-26 2009-04-07 Bbn Technologies Corp. Systems and methods for reserving cryptographic key material
CN1943161B (zh) * 2004-03-02 2010-05-26 Magiq技术公司 用于量子密钥分发的调制器定时
US7697693B1 (en) 2004-03-09 2010-04-13 Bbn Technologies Corp. Quantum cryptography with multi-party randomness
CN1954541B (zh) 2004-03-19 2010-06-16 Magiq技术公司 Qkd系统的激光器自动校准
JP4695594B2 (ja) * 2004-07-12 2011-06-08 三菱電機株式会社 光子検出装置および光通信システム
JP4784202B2 (ja) 2004-09-02 2011-10-05 日本電気株式会社 多重化通信システムおよびそのクロストーク除去方法
US7809269B2 (en) * 2004-09-07 2010-10-05 Magiq Technologies, Inc. Systems and methods for multiplexing QKD channels
JP2008514118A (ja) * 2004-09-15 2008-05-01 マジック テクノロジーズ，インコーポレーテッド Ｑｋｄシステムの不確定性を含む遠隔制御
EP1792434A2 (en) * 2004-09-15 2007-06-06 MagiQ Technologies, Inc. Dual-gated qkd system for wdm networks
JP4654649B2 (ja) * 2004-10-07 2011-03-23 ソニー株式会社 量子暗号通信方法、および量子暗号通信装置、並びに量子暗号通信システム
US7437081B2 (en) * 2004-11-01 2008-10-14 Magiq Technologies, Inc System and method for providing two-way communication of quantum signals, timing signals, and public data
US7450718B2 (en) * 2005-03-03 2008-11-11 Magiq Technologies, Inc One-way synchronization of a two-way QKD system
US7853011B2 (en) * 2005-05-13 2010-12-14 Ciena Corporation Methods and apparatus for monitoring the integrity of a quantum channel supporting multi-quanta pulse transmission
CN101176297B (zh) * 2005-05-17 2014-09-03 朗迅科技公司 量子信息的多信道传输
US20060263096A1 (en) * 2005-05-17 2006-11-23 Mihaela Dinu Multi-channel transmission of quantum information
US7706536B2 (en) * 2005-05-17 2010-04-27 Alcatel-Lucent Usa Inc. Phase locking in a multi-channel quantum communication system
US7502476B1 (en) 2005-05-27 2009-03-10 Magiq Technologies, Inc. Systems and methods of enhancing QKD security using a heralded photon source
US8428259B2 (en) 2005-06-09 2013-04-23 General Dynamics Advanced Information Systems Apparatus and method for all-optical encryption and decryption of an optical signal
US9191198B2 (en) 2005-06-16 2015-11-17 Hewlett-Packard Development Company, L.P. Method and device using one-time pad data
GB2427317B (en) * 2005-06-16 2010-05-19 Hewlett Packard Development Co Quantum key distribution apparatus & method
JP4957952B2 (ja) 2005-06-21 2012-06-20 日本電気株式会社 通信システムおよびそのタイミング制御方法
JP4662040B2 (ja) * 2005-07-08 2011-03-30 日本電気株式会社 通信システムおよびその同期制御方法
FR2889320B1 (fr) * 2005-07-27 2007-10-26 Smartquantum Sa Systeme de transmission optique et dispositif de reception d'un signal optique
US20070110247A1 (en) * 2005-08-03 2007-05-17 Murphy Cary R Intrusion detection with the key leg of a quantum key distribution system
US20070113268A1 (en) * 2005-08-03 2007-05-17 Murphy Cary R Intrusion resistant passive fiber optic components
GB2430124B (en) 2005-09-09 2008-01-09 Toshiba Res Europ Ltd Quantum communication system
US7747019B2 (en) * 2005-09-28 2010-06-29 Nortel Networks Limited Methods and systems for communicating over a quantum channel
US20070076887A1 (en) * 2005-09-30 2007-04-05 Nortel Networks Limited Double phase encoding quantum key distribution
US7889868B2 (en) 2005-09-30 2011-02-15 Verizon Business Global Llc Quantum key distribution system
US20070076878A1 (en) * 2005-09-30 2007-04-05 Nortel Networks Limited Any-point-to-any-point ("AP2AP") quantum key distribution protocol for optical ring network
US7359514B2 (en) * 2005-10-27 2008-04-15 Magiq Technologies, Inc. Narrow-band single-photon source and QKD system using same
JP4748311B2 (ja) * 2005-10-31 2011-08-17 日本電気株式会社 微弱光の光パワー測定方法および装置、それを用いた光通信システム
US20070130455A1 (en) * 2005-12-06 2007-06-07 Elliott Brig B Series encryption in a quantum cryptographic system
US20070133798A1 (en) * 2005-12-14 2007-06-14 Elliott Brig B Quantum cryptography on a multi-drop optical network
US8082443B2 (en) 2006-01-09 2011-12-20 Bbnt Solutions Llc. Pedigrees for quantum cryptography
US7248695B1 (en) * 2006-02-10 2007-07-24 Magiq Technologies, Inc. Systems and methods for transmitting quantum and classical signals over an optical network
JP5146681B2 (ja) * 2006-03-16 2013-02-20 日本電気株式会社 量子暗号伝送システムおよび光回路
GB2439771A (en) * 2006-07-05 2008-01-09 Qinetiq Ltd Clock controlled gating in quantum cryptography apparatus
US7583803B2 (en) * 2006-07-28 2009-09-01 Magiq Technologies, Inc. QKD stations with fast optical switches and QKD systems using same
JP4775919B2 (ja) * 2006-08-04 2011-09-21 三菱電機株式会社 量子通信装置及び量子通信システム及び量子通信方法
US20080158567A1 (en) * 2006-12-28 2008-07-03 Douglas Michael Snyder Quantum messaging device
US7933413B2 (en) * 2007-02-02 2011-04-26 Microsoft Corporation Key exchange verification
WO2009002479A1 (en) 2007-06-21 2008-12-31 University Of Massachusetts Auxetic fabric structures and related fabrication methods
AT505987B1 (de) * 2007-11-07 2011-01-15 Arc Austrian Res Centers Gmbh Qkd-einrichtung
US8811763B2 (en) 2007-12-06 2014-08-19 The United States Of America As Represented By The Secretary Of The Army Method and system for producing image frames using quantum properties
EP2101441A1 (en) 2008-03-13 2009-09-16 University College Cork-National University of Ireland, Cork An optical communication system and method
CN101655779B (zh) * 2008-08-18 2012-04-18 中国科学院物理研究所 真随机数发生器
JP2011130120A (ja) * 2009-12-16 2011-06-30 Sony Corp 量子公開鍵暗号システム、鍵生成装置、暗号化装置、復号装置、鍵生成方法、暗号化方法、及び復号方法
US8433070B2 (en) 2010-05-17 2013-04-30 Raytheon Bbn Technologies Corp. Systems and methods for stabilization of interferometers for quantum key distribution
US8391486B2 (en) 2011-04-28 2013-03-05 The United States Of America As Represented By The Secretary Of The Navy Secure key distribution using sequential weak values
GB2491115B (en) 2011-05-19 2013-08-14 Toshiba Res Europ Ltd Synchronisation of weak light pulse communication system
US9184912B2 (en) * 2012-04-17 2015-11-10 The Boeing Company Secure quantum authentication system
CN106656907B (zh) * 2015-10-28 2021-03-02 阿里巴巴集团控股有限公司 用于认证的方法、装置、终端设备及系统
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US10164778B2 (en) 2016-12-15 2018-12-25 Alibaba Group Holding Limited Method and system for distributing attestation key and certificate in trusted computing
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US10382141B2 (en) * 2017-07-12 2019-08-13 The United States Of America, As Represented By The Secretary Of Commerce Communication linker for communication linking
RU2692431C1 (ru) * 2018-07-03 2019-06-24 Федеральное государственное образовательное учреждение высшего образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева - КАИ" Устройство квантовой рассылки криптографического ключа с частотным кодированием
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US11489670B2 (en) * 2019-11-19 2022-11-01 Qunu Labs Pvt Ltd System and method for transmitting time information and quantum states on an optical medium
FR3104357B1 (fr) 2019-12-04 2022-08-12 Sangle Ferriere Bruno Renouvellement de clés à usage unique
US11429519B2 (en) 2019-12-23 2022-08-30 Alibaba Group Holding Limited System and method for facilitating reduction of latency and mitigation of write amplification in a multi-tenancy storage drive

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4965856A (en) * 1989-05-23 1990-10-23 Arbus Inc. Secure optical-fiber communication system
GB9018973D0 (en) * 1990-08-31 1990-10-17 Secr Defence Optical communications system
US5243649A (en) * 1992-09-29 1993-09-07 The Johns Hopkins University Apparatus and method for quantum mechanical encryption for the transmission of secure communications
US5339182A (en) * 1993-02-19 1994-08-16 California Institute Of Technology Method and apparatus for quantum communication employing nonclassical correlations of quadrature-phase amplitudes
US5307410A (en) * 1993-05-25 1994-04-26 International Business Machines Corporation Interferometric quantum cryptographic key distribution system
US5515438A (en) * 1993-11-24 1996-05-07 International Business Machines Corporation Quantum key distribution using non-orthogonal macroscopic signals

Also Published As

Publication number Publication date
AU5709994A (en) 1994-07-19
EP0676110B1 (en) 1997-04-02
WO1994015422A1 (en) 1994-07-07
ES2101495T3 (es) 1997-07-01
DE69309496D1 (de) 1997-05-07
CA2152628A1 (en) 1994-07-07
EP0676110A1 (en) 1995-10-11
DE69309496T2 (de) 1997-08-07
AU674198B2 (en) 1996-12-12
CA2152628C (en) 1999-02-02
JPH08505019A (ja) 1996-05-28
US5675648A (en) 1997-10-07

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