Patents by Inventor Hoi-Kwong Lo
Hoi-Kwong Lo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11991269Abstract: There is provided a system, method, and computing device for distribution of cryptographic key generation data in a secure network, the secure network comprising a security server and one or more clients. The method including: receiving or generating indexed random data; communicating at least a portion of the indexed random data to one of the clients; and receiving or communicating the indices of the portions of the indexed random data shared with the client, a portion of the indexed random data is used for cryptographic key generation for encrypted communication between the client and another client. In some cases, the above is repeated for each client, wherein the indexed random data is unique for each client.Type: GrantFiled: October 20, 2023Date of Patent: May 21, 2024Inventors: Manfred Von Willich, Mattia Montagna, Hoi-Kwong Lo, Paul O'Leary
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Publication number: 20240163080Abstract: There is provided a system, method, and computing device for distribution of cryptographic key generation data in a secure network, the secure network comprising a security server and one or more clients. The method including: receiving or generating indexed random data; communicating at least a portion of the indexed random data to one of the clients; and receiving or communicating the indices of the portions of the indexed random data shared with the client, a portion of the indexed random data is used for cryptographic key generation for encrypted communication between the client and another client. In some cases, the above is repeated for each client, wherein the indexed random data is unique for each client.Type: ApplicationFiled: October 20, 2023Publication date: May 16, 2024Inventors: Manfred VON WILLICH, Mattia MONTAGNA, Hoi-Kwong LO, Paul O'LEARY
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Publication number: 20220103355Abstract: Systems and methods for key generation between a first user computing device and a second user computing device without requiring direct communication during key generation. The method using a plurality of third-party providers and a first private table and a second private table. The method including: performing by the second user computing device: receiving indexes each associated with a value in the second private table, each index received from the respective third-party provider sharing those values, each index associated with a value that matches an indexed value in the first private table received by the respective third-party provider from the first user computing device; and generating a common key by combining the indexed values of the second private table.Type: ApplicationFiled: October 13, 2021Publication date: March 31, 2022Inventors: Hoi-Kwong LO, Mattia MONTAGNA
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Patent number: 11177950Abstract: Systems and methods for key generation for secure communication between a first user computing device and a second user computing device without requiring direct communication during key generation. The method using a plurality of privacy providers and a first private table and a second private table. The method including: performing by the second user computing device: receiving indexes each associated with a value in the second private table, each index received from the respective privacy provider sharing those values, each index associated with a value that matches an indexed value in the first private table received by the respective privacy provider from the first user computing device; and generating a common key for the secure communication by combining the indexed values of the second private table.Type: GrantFiled: September 30, 2020Date of Patent: November 16, 2021Assignee: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTOInventors: Hoi-Kwong Lo, Mattia Montagna
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Publication number: 20210099296Abstract: Systems and methods for key generation for secure communication between a first user computing device and a second user computing device without requiring direct communication during key generation. The method using a plurality of privacy providers and a first private table and a second private table. The method including: performing by the second user computing device: receiving indexes each associated with a value in the second private table, each index received from the respective privacy provider sharing those values, each index associated with a value that matches an indexed value in the first private table received by the respective privacy provider from the first user computing device; and generating a common key for the secure communication by combining the indexed values of the second private table.Type: ApplicationFiled: September 30, 2020Publication date: April 1, 2021Inventors: Hoi-Kwong LO, Mattia MONTAGNA
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Patent number: 9602220Abstract: The disclosure concerns quantum repeater network system that does not need any matter qubit. According to the quantum repeater network system for performing quantum communication between one transmitter/receiver and the other transmitter/receiver via transmission repeaters and reception repeaters, each of the transmission repeaters prepares quantum systems in an irreducibly entangled state, each of the quantum systems being associated with a reception repeater as a transmission destination, and transmits, to the associated reception repeater, each of the quantum systems in the irreducibly entangled state together with a quantum system entangled with the quantum system.Type: GrantFiled: June 11, 2014Date of Patent: March 21, 2017Assignees: Nippon Telegraph and Telephone Corporation, The Governing Council of the University of TorontoInventors: Koji Azuma, Kiyoshi Tamaki, Hoi-Kwong Lo
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Publication number: 20140363174Abstract: Provided is a quantum repeater network system that does not need any matter qubit. According to the quantum repeater network system for performing quantum communication between one transmitter/receiver and the other transmitter/receiver via transmission repeaters and reception repeaters, each of the transmission repeaters prepares quantum systems in an irreducibly entangled state, each of said quantum systems being associated with a reception repeater as a transmission destination, and transmits, to the associated reception repeater, each of the quantum systems in the irreducibly entangled state together with a quantum system entangled with the quantum system.Type: ApplicationFiled: June 11, 2014Publication date: December 11, 2014Inventors: Koji Azuma, Kiyoshi Tamaki, Hoi-Kwong Lo
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Patent number: 8554814Abstract: Systems and methods for generating a random signal, based on quantum noise in the phase of two or more input signals. The generated output random signal has random variation in its intensity based on the quantum noise in the phases of the input signals.Type: GrantFiled: August 20, 2010Date of Patent: October 8, 2013Assignee: The Governing Council of The University of TorontoInventors: Bing Qi, Hoi-Kwong Lo, Li Qian
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Publication number: 20120045053Abstract: Systems and methods for generating a random signal, based on quantum noise in the phase of two or more input signals. The generated output random signal has random variation in its intensity based on the quantum noise in the phases of the input signals.Type: ApplicationFiled: August 20, 2010Publication date: February 23, 2012Inventors: Bing QI, Hoi-Kwong LO, Li QIAN
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Patent number: 7570767Abstract: An apparatus (1) and method for decoupling error correction from privacy amplification in a quantum key distribution (QKD 100) system includes two or more computer systems (102, 108) linked by quantum and classical channels (120, 122) where each computer system determines a generalized error syndrome associated with quantum communication between the systems, encrypts the generalized error syndrome using a sequence of values, and communicates the encrypted generalized error syndrome via a classical channel (128) to the other system, which uses the encrypted generalized error syndromes to compute error correction for the quantum transmission.Type: GrantFiled: December 20, 2002Date of Patent: August 4, 2009Assignee: MagiQ Technologies, Inc.Inventor: Hoi Kwong Lo
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Patent number: 7415114Abstract: This invention provides a quantum key distribution (QKD) system and method for determining initial quantum keys (QKs), including an initial QKA (220) and an initial QKB (230), determining an initial QKA value of a first function applied to said initial QKA, wherein a value of said first function depends upon values of specified information unit of a QK, including bit i (210), determining an initial QKB value of said first function applied to said initial QKB; and forming a revised QKA by depending a value of an information unit of said revised QKA on a value of information unit i of said initial QKA, if said initial QKA value equals said initial QKB value.Type: GrantFiled: April 30, 2002Date of Patent: August 19, 2008Assignee: MagiQ Technologies, Inc.Inventors: Hoi Kwong Lo, Daniel Gottesman
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Publication number: 20070127932Abstract: The present invention provides an optical phase modulation method using optical frequency shift devices. By accurately controlling the frequency shift, the phase delay experienced by the light signal through an optical medium (fibre, free space, vacuum, or other) can be controlled with high resolution. Hence, phase change can be achieved through frequency change. This technique can be applied to a wide range of applications whenever phase modulation is needed, such as in various phase-shifted keying techniques in optical communications, and in optical metrology. The disclosed phase modulation method can also be used as a phase encoding technique in quantum key distribution.Type: ApplicationFiled: December 1, 2006Publication date: June 7, 2007Inventors: Bing Qi, Li Qian, Hoi-Kwong Lo, Yi Zhao
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Patent number: 7197523Abstract: Apparatus for and methods of random number generation are disclosed, wherein a detector receives a group of n light pulses having single-photon intensity levels. Each of the n light pulses has a probability of less than one to produce a successful detection event at its time of arrival at the detector, and the detector is adapted to detect only one of the n pulses in the group. This single detection per group is thus a discrete random event that occurs only during one of n fixed time slots. The random event occurring during one of n timeslots is converted into a corresponding random integer from 1 to n. A series of such random numbers is generated by using a plurality of groups of n light pulses.Type: GrantFiled: May 3, 2002Date of Patent: March 27, 2007Assignee: Magiq Technologies, Inc.Inventors: Norbert Lutkenhaus, Jayson L. Cohen, Hoi-Kwong Lo
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Patent number: 7069439Abstract: Computing apparatus comprises a memory means storing the instructions of a secure process and an authentication process; a processing means arranged to control the operation of the computing apparatus including by executing the secure process and the authentication process; a user interface means arranged to receive user input and return to the user input; and an interface means for receiving a removable primary token and communication with the token. The token comprises a body supporting a token interface for communicating with the interface means, a token processor; and a token memory adapted to store token data including information for identifying the token and auxiliary token information identifying one or more authorized auxiliary tokens.Type: GrantFiled: March 3, 2000Date of Patent: June 27, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Liqun Chen, Hoi-Kwong Lo, David Chan
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Publication number: 20040190719Abstract: An apparatus (1) and method for decoupling error correction from privacy amplification in a quantum key distribution (QKD 100) system includes two or more computer systems (102, 108) linked by quantum and classical channels (120, 122) where each computer system determines a generalized error syndrome associated with quantum communication between the systems, encrypts the generalized error syndrome using a sequence of values, and communicates the encrypted generalized error syndrome via a classical channel (128) to the other system, which uses the encrypted generalized error syndromes to compute error correction for the quantum transmission.Type: ApplicationFiled: April 8, 2004Publication date: September 30, 2004Inventor: Hoi Kwong Lo
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Publication number: 20040141618Abstract: This invention provides a quantum key distribution (QKD) system and method for determining initial quantum keys (QKs), including an initial QKA (220) and an initial QKB (230), determining an initial QKA value of a first function applied to said initial QKA, wherein a value of said first function depends upon values of specified information unit of a QK, including bit i (210), determining an initial QKB value of said first function applied to said initial QKB; and forming a revised QKA by depending a value of an information unit of said revised QKA on a value of information unit i of said initial QKA, if said initial QKA value equals said initial QKB value.Type: ApplicationFiled: March 1, 2004Publication date: July 22, 2004Inventors: Hoi Kwong Lo, Daniel Gottesman
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Publication number: 20040139132Abstract: In an apparatus and methods of random number generation, a detector (60) receives a plurality of groups of n light pulses (50), which an attenuator (40) typically dims to single-photon intensity levels. Each of the n light pulses has a probability less than one to produce a successful detection event at its time of arrival at the detector, but the detector detects only one of the n pulses per group. This single detection per group is thus a discrete random event. This detection even can occur only during one of n fixed timeslots during which a pulse may arrive at the detector. The method of the invention converts the random event at one of n timeslots into a random integer from 1 to n. The expected arrival time of the first pulse of the group becomes a timing reference with which to start a timer (90) and define the define the timeslots electronically.Type: ApplicationFiled: September 22, 2003Publication date: July 15, 2004Inventors: Norbert Lutkenhaus, Jayson L . Cohen, Hoi-Kwong Lo
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Patent number: 5732139Abstract: A secure method for distributing a random cryptographic key with reduced data loss. Traditional quantum key distribution systems employ similar probabilities for the different communication modes and thus reject at least half of the transmitted data. The invention substantially reduces the amount of discarded data (those that are encoded and decoded in different communication modes e.g. using different operators) in quantum key distribution without compromising security by using significantly different probabilities for the different communication modes. Data is separated into various sets according to the actual operators used in the encoding and decoding process and the error rate for each set is determined individually. The invention increases the key distribution rate of the BB84 key distribution scheme proposed by Bennett and Brassard in 1984. Using the invention, the key distribution rate increases with the number of quantum signals transmitted and can be doubled asymptotically.Type: GrantFiled: August 26, 1996Date of Patent: March 24, 1998Inventors: Hoi-Kwong Lo, Hoi Fung Chau