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1. 发明申请

WO2023002148A1 QUANTUM KEY DISTRIBUTION PROTOCOL ADAPTER 审中-公开
公开(公告)号：WO2023002148A1
公开(公告)日：2023-01-26
申请号：PCT/GB2022/051640
申请日：2022-06-27
申请人： ARQIT LIMITED
发明人： WEBB, David , KHAITAN, Prakash
IPC分类号： H04L9/08
摘要： A quantum key distribution (QKD) protocol adapter and method providing a first interface presenting a QKD protocol to a network element and a second interface arranged to use a key management protocol to communicate with a hardware security module (HSM). The adapter being arranged to use group shared keys provided to the HSM by a QKD system, and the adapter being arranged to respond to key status requests and key requests from the network element in the QKD protocol by interacting with the HSM using the key management protocol, and being arranged to provide the requested key status information or keys to the network element in the QKD protocol.

2. 发明申请

WO2022162390A1 KEY EXCHANGE PROTOCOL FOR QUANTUM NETWORK 审中-公开
公开(公告)号：WO2022162390A1
公开(公告)日：2022-08-04
申请号：PCT/GB2022/050243
申请日：2022-01-28
申请人： ARQIT LIMITED
发明人： YEOMANS, Andrew , MURPHY, Michael , COHEN, Oliver , IQBAL, Omar , BROWN, James
IPC分类号： H04L9/08
摘要： Methods, apparatus, and systems are provided for performing a key exchange 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. 发明申请

WO2023067297A1 WAVELENGTH MULTIPLEXING FOR AN OPTICAL COMMUNICATION SYSTEM 审中-公开
公开(公告)号：WO2023067297A1
公开(公告)日：2023-04-27
申请号：PCT/GB2022/052455
申请日：2022-09-28
申请人： ARQIT LIMITED
发明人： KOEHLER-SIDKI, Alexander , PARKER, Ryan , IQBAL, Omar
IPC分类号： H04B10/70 , H04J14/02 , H04L9/08
摘要： An optical communication system, a receiver, a transmitter, and a method of operating thereof are provided. The method includes: at a transmitter 2: emitting 50 N single-wavelength quantum beams from N faint photon sources 8; multiplexing 52 the N single-wavelength quantum beams using a first wavelength division multiplexer (WDM) 22 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 54 the combined multi-wavelength quantum beam to a receiver; and at the receiver 3: de-multiplexing 56 the combined multi-wavelength quantum beam according to the wavelength using a second WDM 26 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 resulting 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; tagging 64 each single photon detection event resulting from each single-wavelength quantum beam according to time, and at least one of: a wavelength of photons associated with the detection event, and an identity of the detecting single photon detection unit responsible for the detection event, thereby introducing a correlation between the time at which the detection event is registered, and at least one of: the wavelength of the photons associated with the detection event, and the identity of the detecting single photon detection unit responsible forthe detection event; and assigning a detection time-period to the detection event based on the correlation.

4. 发明申请

WO2022018432A1 KEY EXCHANGE PROTOCOL 审中-公开
公开(公告)号：WO2022018432A1
公开(公告)日：2022-01-27
申请号：PCT/GB2021/051863
申请日：2021-07-20
申请人： ARQIT LIMITED
发明人： BURNS, Daryl , CHILDE, Barry , WILLIAMS, David
IPC分类号： H04L9/00 , H04L9/08
摘要： Methods, apparatus, and systems are provided for performing a secure communication between a sender device and receiver device. This includes encapsulating or encrypting, by the sender device, a message using a post-quantum cryptographic algorithm and quantum key (QK) material derived from QK distribution with a receiver device. Noise is added, by the sender device, to the encapsulated or encrypted message. The sender device sends the noisy encapsulated/encrypted message to the receiver device. On receipt of the noisy encapsulated or encrypted message from the sender device, the receiver device decapsulates or decrypts the received message using corresponding QK used by the sender device. The receiver device decapsulates or decrypts the QK decapsulated/decrypted message using the corresponding post-quantum cryptographic algorithm used by the sender, and the receiver device outputs or uses the message sent by the sender.

5. 发明申请

WO2020053565A1 AUTONOMOUS QUALITY REGULATION FOR DISTRIBUTED LEDGER NETWORKS 审中-公开
公开(公告)号：WO2020053565A1
公开(公告)日：2020-03-19
申请号：PCT/GB2019/052509
申请日：2019-09-09
申请人： ARQIT LIMITED
发明人： WILLIAMS, David
IPC分类号： H04L12/26 , H04L12/851
摘要： Methods, apparatus, and systems are provided for operating a distributed ledger network (100), the distributed ledger network (100) comprising a plurality of nodes (102a-102n, 104a- 04m), the plurality of nodes comprising a group of nodes (104), wherein each node in the group of nodes (104) includes functionality for acting as a trusted third party node on a distributed ledger transaction, the method comprising: performing an operating performance test on one or more selected nodes (104a-104m) of the group of nodes (104), wherein the operating performance test comprises sending a plurality of test messages to each selected node (104a-104m) over a predetermined time period; receiving operating performance data associated with each selected node (104a-104m) in relation to the operating performance test; aggregating operating performance statistics for each selected node (104a-104m) based on the received operating performance responses; and indicating to the distributed ledger network (100) those selected nodes (104a-104m) satisfying one or more operating performance benchmark(s) for acting as a trusted third party for distributed ledger transactions over the distributed ledger network (100) based on the aggregated operating performance statistics.

6. 发明申请

WO2022200757A1 A SYSTEM AND METHOD FOR TIME SYNCHRONISATION 审中-公开
公开(公告)号：WO2022200757A1
公开(公告)日：2022-09-29
申请号：PCT/GB2022/050459
申请日：2022-02-21
申请人： ARQIT LIMITED
发明人： IQBAL, Omar , HASELWOOD, Sam , LEE, Cassie
IPC分类号： H04L9/08 , H04B10/70
摘要： A method and system for time synchronisation in a satellite based quantum key distribution (QKD) system, by: at a transmitter, emitting a first series of laser pulses, the first series of laser pulses being encoded to form a quantum beam; at the transmitter, emitting a second series of laser pulses, the second series of laser pulses having a predetermined repeating pattern; and at the transmitter, sending the first and second series of laser pulses to a receiver. At a receiver, receiving the first series of laser pulses and the second series of laser pulses at the receiver and determining reception times of pulses of the first series of laser pulses and pulses of the second series of laser pulses. Comparing the received second series of laser pulses to the predetermined pattern at different points in the predetermined pattern, and determining the point at which the received second series of laser pulses is most strongly correlated to the predetermined pattern; with the received second series of laser pulses aligned to the predetermined pattern at the determined point, determining a relationship fitting respective reception times of a plurality of the received pulses to respective emission times of corresponding ones of the second series of laser pulses; and using the determined relationship to convert between reception times of the first series of laser pulses and emission times of corresponding ones of the first series of laser pulses.

7. 发明申请

WO2022162392A1 KEY EXCHANGE PROTOCOL FOR SATELLITE BASED QUANTUM NETWORK 审中-公开
公开(公告)号：WO2022162392A1
公开(公告)日：2022-08-04
申请号：PCT/GB2022/050245
申请日：2022-01-28
申请人： ARQIT LIMITED
发明人： YEOMANS, Andrew , IQBAL, Omar , CHILDE, Barry
IPC分类号： H04L9/08
摘要： Methods, apparatus, and systems are provided for performing a key exchange using a quantum key distribution (QKD) protocol between a first device, a second device, and an intermediary device. The intermediary device receives: a first set of symbols over a first quantum channel transmitted from the first device; and sends a first receiving basis information to the first device, where the first device withholds from the intermediary device the first transmitting basis information for transmitting said first set of symbols over the first quantum channel. The intermediary device transmits: a second set of symbols over a second quantum channel transmitted to the second device; and transmits a second transmitting basis information to the second device, where the second device withholds from the intermediary device the second receiving basis information for receiving said second set of symbols over the first quantum channel. The intermediary device generates first and second intermediate sets of symbols based on the validly received first set of symbols and transmitted second set of symbols received/transmitted over the quantum channels. The intermediary device generates a third intermediate set of symbols based on combining the first and second intermediate sets of symbols and sends the third intermediate set of symbols to the second device and/or first device. The first device and second device perform a key exchange by exchanging with themselves the first transmitting and second receiving basis information and/or first receiving and second transmitting basis information to determine a final shared key based on the first set of symbols, the second set of symbols and the third intermediate set of symbols.

8. 发明申请

WO2022162381A1 QKD SWITCHING SYSTEM 审中-公开
公开(公告)号：WO2022162381A1
公开(公告)日：2022-08-04
申请号：PCT/GB2022/050232
申请日：2022-01-28
申请人： ARQIT LIMITED
发明人： YEOMANS, Andrew , BURNS, Daryl , WILLIAMS, David
IPC分类号： H04L9/08
摘要： Methods, apparatus, and systems are provided for quantum key distributed (QKD) linking apparatus and system for use with at least two end point devices for linking said endpoint devices in a QKD network. The QKD linking apparatus including a plurality of QKD links, each QKD link having a communication medium comprising a quantum channel and a classical channel, wherein each endpoint is assigned a QKD link connecting said each endpoint to the QKD linking apparatus, a quantum transmission component comprising a plurality of quantum transmitters, each quantum transmitter configured for transmitting quantum transmissions over a quantum channel of one of the QKD links, a classical transceiver component comprising a plurality of classical transceivers, each classical transceiver configured for transmitting classical data over a classical channel of one of the QKD links and configured for receiving classical data over the classical channel of said one of the QKD links; and a controller connected to the quantum transmission component and the classical transceiver component, the controller configured to: route or switch data generated for quantum transmission to an endpoint via a quantum transmitter assigned to the endpoint over a quantum channel of the QKD link of the endpoint; route or switch classical data for classical transmission to an endpoint via a classical transceiver assigned to the endpoint over a classical channel of the QKD link of the endpoint; and route or switch classical data received by a classical transceiver over the classical channel of the QKD link of an endpoint as required. The controller may be configured to perform any QKD protocol for exchanging keys between endpoints and switch/route data flows between the QKD linking apparatus and/or one or more endpoints via the quantum and classical channels of the QKD links. Thereafter, the controller may be configured to enable secure communications between the endpoints via the classical channels of the QKD links of the endpoints.

9. 发明申请

WO2022157501A1 A SYSTEM AND METHOD FOR TRUSTLESS KEY PROVISIONING 审中-公开
公开(公告)号：WO2022157501A1
公开(公告)日：2022-07-28
申请号：PCT/GB2022/050164
申请日：2022-01-21
申请人： ARQIT LIMITED
发明人： CHILDE, Barry , DAPRE, Jon , WEBB, David , WILLIAMS, David , BROWN, James , MARI, Michael
IPC分类号： H04L9/08 , H04L9/14
摘要： A method of encryption key provisioning comprising: providing, by a quantum computing safe method, a shared secret data to a device and also to a security service; using the provided shared secret data to provide a root key; and using the root key as a basis for a sequence of stages, wherein each stage comprises an operation which converts a start key into a different generated key, and the same stages are carried out in parallel at the device and at the security service; wherein the root key is used as the start key for a first stage of the sequence, and a generated key produced by each stage of the sequence, except for the final stage of the sequence, is used as a start key for a next stage of the sequence; and wherein the generated keys produced by the last stage of the sequence at the device and at the security service are symmetric keys.

10. 发明申请

WO2022153039A1 SYSTEM AND METHOD FOR GROUP KEY FORMATION 审中-公开
公开(公告)号：WO2022153039A1
公开(公告)日：2022-07-21
申请号：PCT/GB2022/050050
申请日：2022-01-11
申请人： ARQIT LIMITED
发明人： BURNS, Daryl , WEBB, David , WILLIAMS, David
IPC分类号： H04L9/08
摘要： Methods, apparatus, and systems are provided for creating a group key for a group of N parties using an intermediary, where at least N-1 of the parties are arranged in an ordered ring. When the party is in the ring, the party is configured to: share or negotiate a cryptographic key of the party with an adjacent party in the ring, where each party in the ring has another cryptographic key of an adjacent party; generate a meeting key for the party based on combining the cryptographic key of the party with a shared cryptographic key from an adjacent party; Send the meeting key to the intermediary and receive an intermediate key from the intermediary. The intermediary computes the intermediate key based on combining two or more meeting keys of corresponding parties in the ring. The party is further configured to: create the group key based on combining the cryptographic key of the party with the received intermediate key. When the party is not in the ring, the party is configured to: share a cryptographic key of an adjacent party in the ring with the party; receive the intermediate key of the adjacent party in the ring from the intermediary; and create the group key based on combining the shared cryptographic key of the adjacent party with the received intermediate key. In any event, the party uses the created group key in communications or other purposes with one or more other parties of the group.

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