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1. 发明公开

US20240204998A1 RANDOM NUMBER GENERATION IN QUANTUM KEY DISTRIBUTION 审中-公开
公开(公告)号：US20240204998A1
公开(公告)日：2024-06-20
申请号：US18286692
申请日：2022-05-11
申请人： ARQIT LIMITED
发明人： Andrew Yeomans , Omar Iqbal , David Bestwick
IPC分类号： H04L9/08
CPC分类号： H04L9/0858 , H04L9/0819 , H04L9/0869
摘要： A method of operating a quantum key distribution (QKD) system including using a quantum random number generator (QRNG) to generate a random number string (RNS), and storing the RNS; providing the RNS to a first cryptographically secure pseudo-random number generator (CSPRNG) which uses random numbers of the RNS as seeds to generate respective first strings of pseudo-random numbers; using the first strings of pseudo-random numbers to encode photons or pulses transmitted by a transmitter of the QKD system; after a predetermined delay, providing the stored RNS to a second CSPRNG which uses random numbers of the RNS as seeds to generate respective second strings of pseudo-random numbers, the second CSPRNG identically configured to the first CSPRNG; using the second strings of pseudo-random numbers, together with information regarding encoded photons or pulses received by a receiver of the QKD system, to agree secure keys between the transmitter and the receiver.

2. 发明申请

US20220407688A1 QUANTUM KEY DISTRIBUTION PROTOCOL 有权
公开(公告)号：US20220407688A1
公开(公告)日：2022-12-22
申请号：US17775210
申请日：2020-11-06
申请人： Arqit Limited
发明人： Barry Childe , David Bestwick , David Williams , Andrew James Victor Yeomans , Omar Iqbal
IPC分类号： H04L9/08
摘要： Methods, apparatus, and systems are provided for performing a quantum key distribution (QKD) protocol between a first device, a second device, and an intermediary device. The intermediary device transmitting: a first secret symbol string over a first quantum channel to the first device; a first basis set over a first communication channel to the first device. The intermediary device; a second secret symbol string over a second quantum channel to the second device; a second basis set over a second communication channel to the second device. The intermediary device generating a third symbol string based on combining the first and second secret symbol strings and transmitting to the second device, via the second communication channel, data representative of the third symbol string. The first device and second device perform a quantum key exchange and sifting based on the corresponding received first and second secret symbol strings and first and second basis sets, and a fourth set of symbols generated by the second device generates a fourth set of symbols based on combining the second received secret symbols with the received third symbol string.

3. 发明公开

US20240313949A1 KEY EXCHANGE PROTOCOL FOR QUANTUM NETWORK 审中-公开
公开(公告)号：US20240313949A1
公开(公告)日：2024-09-19
申请号：US18274655
申请日：2022-01-28
申请人： ARQIT LIMITED
发明人： Andrew Yeomans , Michael Murphy , Oliver Cohen , Omar Iqbal , James Brown
IPC分类号： H04L9/08
CPC分类号： H04L9/0819 , H04L9/0855
摘要： A method for performing a key exchange between a first device, a second device, and an intermediary device, wherein the intermediary device: transmits to the first device a first secret symbol string over a first quantum channel and a first basis set over a first channel, transmits to the second device a second secret symbol string over a second quantum channel and a second basis set over a second channel, and generates a third symbol string by combining the first and second secret symbol strings and transmits data representative of the third symbol string to the second device, whereby the first and second devices perform a quantum key exchange and sifting based on the first and second secret symbol strings and first and second basis sets, and a fourth set of symbols is generated by the second device by combining the second secret symbols with the third symbol string.

4. 发明公开

US20240129116A1 KEY EXCHANGE PROTOCOL FOR SATELLITE BASED QUANTUM NETWORK 审中-公开
公开(公告)号：US20240129116A1
公开(公告)日：2024-04-18
申请号：US18274852
申请日：2022-01-28
申请人： ARQIT LIMITED
发明人： Andrew Yeomans , Omar Iqbal , Barry Childe
IPC分类号： H04L9/08
CPC分类号： H04L9/0852 , H04L9/085
摘要： A method for performing a key exchange using a quantum key distribution protocol between a first device (D1), a second device (D2), and an intermediary device (ID), wherein: ID receives first symbol set (SS1) over first quantum channel (QC1) transmitted from D1 and sends first receiving basis information (RBI1) to D1 which withholds from ID first transmitting basis information (TBI1); ID transmits second symbol set (SS2) over second quantum channel (QC2) and second transmitting basis information (TBI2) to D2 which withholds from ID second receiving basis information (RBI2); ID generates first (IS1) and second intermediate symbol (IS2) sets based on valid SS1 and SS2; wherein ID generates third intermediate symbol (IS3) set by combining IS1 and IS2 and sends IS3 set to D1 and/or D2; wherein D1 and D2 exchange TBI1 and RBI2 and/or RBI1 and TBI2 to determine a final shared key based on SS1, SS2, and IS3 sets.

5. 发明公开

US20240106641A1 KEY EXCHANGE PROTOCOL FOR SATELLITE BASED QUANTUM NETWORK 审中-公开
公开(公告)号：US20240106641A1
公开(公告)日：2024-03-28
申请号：US18274807
申请日：2022-01-28
申请人： ARQIT LIMITED
发明人： Andrew Yeomans , Omar Iqbal , Barry Childe
IPC分类号： H04L9/08
CPC分类号： H04L9/088
摘要： A system for performing a key exchange using a quantum key distribution protocol between first, second, and intermediary devices, wherein the intermediary device: receives first symbol set over a first quantum channel transmitted from first device and sends first receiving basis information to first device, receives second symbol set over a second quantum channel transmitted from second device and sends second receiving basis information to second device, generates first and second intermediate sets of symbols based on received first and second sets of symbols, generates third intermediate symbol set by combining first and second intermediate sets and sends third intermediate set to first and/or second device, whereby first and second devices perform the key exchange by exchanging with themselves first and second transmitting basis information and/or first and second receiving basis information to determine a final shared key based on first, second, and third intermediate symbol sets.

6. 发明申请

US20230020193A1 QUANTUM-SAFE NETWORKING 有权
公开(公告)号：US20230020193A1
公开(公告)日：2023-01-19
申请号：US17775204
申请日：2020-11-06
申请人： Arqit Limited
发明人： David Williams , Barry Childe , David Bestwick , Andrew James Victor Yeomans , Omar Iqbal
IPC分类号： H04L9/08 , H04L9/32
摘要： Method(s), system(s), apparatus are provided for storing one or more data item(s) in a quantum-safe (QS) network. The QS network comprising one or more QS server(s) and a repository for storing and accessing said data item(s). Each QS server comprising a hardware security module (HSM) for storing an identical set of quantum distributed (QD) keys. The identical set of QD keys having been distributed to each of said QS server(s) in a quantum-safe manner. The QS server(s) are configured to communicate securely with each other and the repository using one or more available QD keys from the identical set of QD keys. A QS server performs generating a quantum reference (QREF) locator based on input data associated with a data item for storage and an available QD key selected from the set of QD keys, and sending the QREF locator along with the data item encrypted with the available QD key to the repository for storage.

7. 发明申请

US20220393865A1 A SYSTEM AND METHOD FOR SATELLITE QUANTUM KEY DISTRIBUTION 有权
公开(公告)号：US20220393865A1
公开(公告)日：2022-12-08
申请号：US17775201
申请日：2020-11-06
申请人： Arqit Limited
发明人： David Williams , David Bestwick , Barry Childe , Andrew James Victor Yeomans , Omar Iqbal
IPC分类号： H04L9/08 , H04B7/185 , H04B10/70
摘要： A method of scheduling and managing key data in a satellite quantum key distribution system comprising a constellation of one or more satellites and a plurality of user ground stations. The method comprises: using a satellite of the constellation of satellites to deliver key data to a user ground station using a quantum communication link; at the user ground station, storing the delivered key data and reporting the amount of delivered key data; using the satellite to deliver key data to at least one other user ground station requiring common encryption keys with the user ground station using a respective quantum communication link; at each other user ground station, storing the delivered key data and reporting the amount of delivered key data; based upon the reports, determining an amount of the delivered key data which is commonly stored at all of the user ground station and the at least one other user ground station; and instructing the user ground station and the at least one other user ground station to release the commonly stored delivered key data

8. 发明授权

US12137160B2 Method of management of remote operations 有权
公开(公告)号：US12137160B2
公开(公告)日：2024-11-05
申请号：US17775214
申请日：2020-11-06
申请人： Arqit Limited
发明人： David Williams , Barry Childe , David Bestwick , Andrew James Victor Yeomans , Omar Iqbal
IPC分类号： H04L9/08 , H04B7/185 , H04B10/70
CPC分类号： H04L9/0855 , H04B7/18508 , H04B10/70
摘要： A method of scheduling encryption key delivery communication sessions in a satellite quantum key distribution system comprising a constellation of one or more satellites and a plurality of user ground stations comprises producing a list of user ground stations requiring encryption keys. For each satellite of the constellation of satellites, determining a region of the earths surface within which the satellite can carry out encryption key delivery communication sessions to user ground stations using a quantum optical communications link during a scheduling period. Obtaining a cloud cover map. Comparing the locations of the listed user ground stations, the determined regions of the earths surface for the constellation of satellites, and the cloud cover map, to identify listed user ground stations to which encryption key delivery can be carried out by the constellation of satellites during the scheduling period. Determining which of the identified user ground stations each satellite of the constellation of satellites will carry out encryption key delivery communication sessions with at different times in the scheduling period based upon one or more of: an amount of unused encryption keys at each identified user ground station; and an expected time duration before each identified user ground station runs out of encryption keys.

9. 发明公开

US20240348432A1 WAVELENGTH MULTIPLEXING FOR AN OPTICAL COMMUNICATION SYSTEM 审中-公开
公开(公告)号：US20240348432A1
公开(公告)日：2024-10-17
申请号：US18702240
申请日：2022-09-28
申请人： Arqit Limited
发明人： Alexander Koehler-Sidki , Ryan Parker , Omar Iqbal
IPC分类号： H04L9/08 , H04J14/02
CPC分类号： H04L9/0852 , H04J14/0305
摘要： A system and method including at a transmitter emitting N single-wavelength quantum beams from N faint photon sources; multiplexing the N single-wavelength quantum beams using a first wavelength division multiplexer (WDM) to produce a combined multi-wavelength quantum beam, wherein the combined multi-wavelength quantum beam comprises a series of interleaved single-photon events having different wavelengths, and has a repetition rate N times that of individual single-wavelength quantum beams; transmitting the combined multi-wavelength quantum beam to a receiver; and at the receiver: de-multiplexing the combined multi-wavelength quantum beam according to the wavelength using a second WDM to recover the N single-wavelength quantum beams; at N single photon detection units, receiving a respective quantum beam of the N quantum beams and detecting single photon events from the respective quantum beam, such that each single photon detection unit corresponds to a respective quantum beam and as such the respective wavelength of that quantum beam.

10. 发明授权

US12058248B2 Quantum-safe networking 有权
公开(公告)号：US12058248B2
公开(公告)日：2024-08-06
申请号：US17775204
申请日：2020-11-06
申请人： Arqit Limited
发明人： David Williams , Barry Childe , David Bestwick , Andrew James Victor Yeomans , Omar Iqbal
IPC分类号： H04L9/08
CPC分类号： H04L9/0855 , H04L9/0825 , H04L9/0877
摘要： Method(s), system(s), apparatus are provided for storing one or more data item(s) in a quantum-safe (QS) network. The QS network comprising one or more QS server(s) and a repository for storing and accessing said data item(s). Each QS server comprising a hardware security module (HSM) for storing an identical set of quantum distributed (QD) keys. The identical set of QD keys having been distributed to each of said QS server(s) in a quantum-safe manner. The QS server(s) are configured to communicate securely with each other and the repository using one or more available QD keys from the identical set of QD keys. A QS server performs generating a quantum reference (QREF) locator based on input data associated with a data item for storage and an available QD key selected from the set of QD keys, and sending the QREF locator along with the data item encrypted with the available QD key to the repository for storage.

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