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174
results.
Updated on
15/09/2026 [09:23:00]
Results 125 to 150 of 174
Absstract of: EP4770006A1
A quantum key distribution network (NWQKD) includes a plurality of QKD nodes (10) and a QKDN controller (20). The plurality of QKD nodes (10) perform key relays by a quantum key distribution link (L) and a network thereof. The QKDN controller (20) divides the plurality of QKD nodes (10) into a plurality of independent colonies (C) so as to equalize throughputs of the key relays, and sets routes from a colony (CS) including a first QKD node (10S) that is a start point of the key relays to a colony (CR) including a second QKD node (10r) that is an end point of the key relays so that a route for each key traverses a different colony (C) so that a single QKD node (10) does not supply keys to a plurality of routes.
Absstract of: EP4770003A1
Verwendung eines Neutrino-Detektors als vertrauenswürdiger Knoten (Trusted Node) in einem Verfahren zum kryptographischen Schlüsselaustausch zwischen einem ersten Kommunikationsendpunkt und einem zweiten Kommunikationsendpunkt, wobei der Neutrino-Detektor:- über einen ersten Neutrino-basierten Kommunikationskanal einen ersten kryptographischen Schlüssel von dem ersten Kommunikationsendpunkt empfängt,- über einen zweiten Neutrino-basierten Kommunikationskanal einen zweiten kryptographischen Schlüssel von dem zweiten Kommunikationsendpunkt empfängt,- die beiden kryptographischen Schlüssel in einem Schlüsselspeicher speichert,- über einen öffentlichen Kommunikationskanal eine am ersten Kommunikationsendpunkt erzeugte Zufallszahl (RND) empfängt, die unter Verwendung des ersten kryptographischen Schlüssels verschlüsselt ist,- die Zufallszahl (RND) unter Verwendung des gespeicherten ersten kryptographischen Schlüssels entschlüsselt und- die entschlüsselte Zufallszahl (RND) unter Verwendung des im Schlüsselspeicher gespeicherten zweiten kryptographischen Schlüssels verschlüsselt und über einen öffentlichen Kommunikationskanal an den zweiten Kommunikationsendpunkt sendet, um dem zweiten Kommunikationsendpunkt die Rekonstruktion der Zufallszahl (RND) unter Verwendung des ihm bekannten zweiten kryptographischen Schlüssels zu ermöglichen, sodass dem ersten und dem zweiten Kommunikationsendpunkt eine gemeinsame Zufallszahl (RND) als kryptographischer Schlüssel z
Absstract of: EP4770002A1
Verfahren zum Austausch eines kryptografischen Schlüssels zwischen einem Sender und einem Empfänger unter Verwendung eines Neutrino-basierten Kommunikationskanals, umfassend die Schritte:Senderseitige Erzeugung eines Neutrino-Strahls durch:- Beschleunigen von Protonen in einem Protonenstrahl,- Auslenkung des Protonenstrahls auf ein Target zur Erzeugung von Neutrinos durch den Zerfall kurzlebiger Teilchen;Senderseitige Generierung einer Folge von Zufallsbits, die den kryptografischen Schlüssel repräsentiert, und Kodierung der Zufallsbits durch:- Steuerung der Auslenkung des Protonenstrahls mittels eines steuerbaren Ablenksystems, um entsprechend der Zufallsbits den Protonenstrahl entweder auf das Target oder auf einen Absorber zu lenken, wodurch die Zufallsbits als Neutrino-Pulse kodiert werden;Übertragung der Neutrino-Pulse vom Sender zum Empfänger;Synchronisierung von Sender und Empfänger mittels einer Zeitsynchronisationseinheit, die die Taktung der erzeugten Neutrino-Pulse mit Zeitfenstern des Empfängersystems synchronisiert;Empfang der Neutrino-Pulse durch einen Neutrino-Detektor des Empfängers, wobei:- Zerfallsprodukte, insbesondere Lichtsignale, die bei der Wechselwirkung der Neutrinos mit einem Detektormedium erzeugt werden, detektiert werden und- die detektierten Signale jeweils einem Schlüsselbit zugeordnet werden;Speicherung und Aneinanderreihung der empfangenen Schlüsselbits zur Erzeugung des kryptografischen Schlüssels, der in einem Schlüsselspeicherm
Absstract of: WO2025093379A1
Disclosed is a method for sharing information between a sender node and a receiver node in accordance with a quantum communication protocol. The method comprises: determining an attack configuration for access by a third party to the quantum channel, the attack configuration being defined by at least a quantum circuit system having specific parameters and an attack success bound, the quantum circuit system being configured to intercept a qubit on the quantum channel, determine the state of the intercepted qubit; using the quantum circuit system to measure first and second metrics by at least intercepting qubits on the quantum channel; determining whether the second metric fulfils an error tolerance bound and whether the first metric fulfills the attack success bound; aborting the communication protocol if the second metric fulfils the error tolerance bound and the first metric fulfills the attack success bound.
Absstract of: CN122316608A
本发明公开了一种密文量子密钥管理与中继方法及系统，方法包括向中继节点下发路由控制信息及第一加密信息，以使所述中继节点基于所述第一加密信息将其从所连接的QKD设备接收的量子密钥密文转换为量子密钥明文异或值，并将所述量子密钥明文异或值按照所述路由控制信息指定方式中继至目的节点；所述量子密钥密文为QKD设备利用本地密钥加密密钥加密其生成的量子密钥得到，所述第一加密信息携带有与所述密钥加密密钥相同的第一密钥加密密钥；本发明中KM不掌握量子密钥的加密密钥，在进行密钥中继过程中不会出现量子密钥明文，从而降低了量子密钥泄露的风险。
Absstract of: US2025131317A1
A system and method for providing quantum entanglement-as-a-service and simultaneously producing verifiably random sequences of numbers are described. When distributing quantum entanglement between customers Alice and Bob, Alice and Bob may exchange information pertaining to a measurement basis that they respectively used when performing measurements using respective halves of entangled particles. When customer Alice, for example, determines that both Alice and Bob have performed a given measurement in a same measurement basis, said result may be used in a quantum key distribution (QKD) code. When customer Alice determines that they have not performed the given measurement in the same measurement basis, Alice may concatenate said portion of the results into a private and verifiable sequence of random numbers. Providing distributed quantum entanglement therefore results in both a QKD code between said customers and in respective private and verifiably random sequences of numbers.
Absstract of: KR20260100044A
0001a 본 발명은 광섬유 간섭계 기반의 지연 시간 오차 측정 장치에 관한 것으로서, 상세하게는 포토커플러에 의해 포톤 신호를 두 개의 경로로 나누고, 하나는 피드백 회로로, 다른 하나는 10센티미터 거리로 지연되도록 제어하는 기술을 제공하는 것으로서, 이를 통해 시간 지연 오차를 1ps 이하로 유지하며 신뢰성을 확보할 수 있는 광섬유 간섭계 기반의 지연 시간 오차 측정 장치에 관한 것이다. 본 발명에 의하면, 기준 경로와 감지 경로 사이의 시간 차이를 500ps로 고정하고 그 오차를 1ps 이하로 억제함으로써, 두 신호가 광섬유 마이켈슨 간섭계에서 형성하는 간섭 패턴의 위상차를 정확하게 제어할 수 있다. 이를 통해 수신부에서 검출되는 간섭무늬가 선명하게 유지되며, 양자 비트(Quantum Bit) 판별 시 발생하는 시간적, 위상적 오차가 최소화된다.
Absstract of: WO2025100599A1
In the present disclosure, an operating method of a first device in a quantum communication system may comprise the steps of: receiving an initial photon sequence including a plurality of sample photons from a second device through a quantum channel; performing a first stability check on the basis of at least one of the plurality of sample photons; determining a first division sequence and a second division sequence in which a first message is encoded, on the basis of the initial photon sequence; transmitting the second division sequence to the second device through the quantum channel; performing a second stability check on the basis of at least one of the plurality of sample photons included in the second division sequence; and receiving, from the second device, a signal in which a second message is encoded.
Absstract of: WO2026135455A1
This disclosure pertains to a method for real-time state-validation of entanglement between at least two independent distant quantum nodes in an extendible quantum network. Each quantum node comprises at least a communication qubit. The quantum network comprises a midpoint, comprising a measurement apparatus for measuring a herald in a quantum signal, and a digital logic unit for calculating the measurement result. The method comprises the steps of receiving a hybrid signal comprising a quantum signal and a classical signal; measuring, each of the quantum signals to validate entanglement; validating the entanglement based on the outcome of the measurement and on the state-validation information of the classical signal; sending a classical message about the validation of the entanglement attempt.
Absstract of: WO2026132391A1
Methods and systems are disclosed for synchronising a first block of quantum key material in a first QKD node with a second QKD node. The first QKD node and the second QKD node share a quantum key material generator. The method comprises ingesting, by the first QKD node, the first block of quantum key material from the quantum key material generator and storing, by the first QKD node, the first block of quantum key material in association with a first state of a first finite-state machine. The first state of the first finite-state machine may indicate that the first block of quantum key material has not been synchronised. The method further comprises sending, by the first QKD node, a synchronisation request to the second QKD node and associating the first block of quantum key material with a second state of the first finite-state machine. The synchronisation request identifies the first block of quantum key material. The second state of the first finite-state machine may indicate that the first block of quantum key material is in a process of being synchronised. The method further comprises in dependence on a response being received, by the first QKD node, from the second QKD node, associating the first block of quantum key material with an updated state of the first finite-state machine.
Absstract of: US20260180794A1
0000 One or more embodiments address the transition to Post Quantum Cryptography (PQC) within secure element hardware environments. The embodiments focus on key management solutions for resource-constrained devices running JAVA CARD or similar platforms. PQC implementations face challenges from large key sizes that strain secure element resources, including RAM, ROM, flash memory, input/output bandwidth, and processing capabilities. The embodiments present methods for handling PQC keys through importation, exportation, generation, storage, utilization, and protection operations. The implementation manifests as an Application Programming Interface (API) that enables applications to leverage key management capabilities efficiently within secure element resource constraints. The API delivers advantages through memory optimization using flexible condensation and derivation mechanisms. Security benefits emerge from integrating key operations within the certified platform environment, enabling hardware acceleration and side-channel attack countermeasures through native code implementation.
Absstract of: US20260178754A1
A method of enabling custom cryptography is provided. The method can include sending, by a first computing device and to a second computing device, instructions to initiate a proxy. The proxy can be configured to intercept a message of a user agent. The user agent may be associated with the second computing device. The proxy can be further configured to perform custom cryptography based on the message to obtain a modified message. The custom cryptography may comprise post-quantum cryptography. The proxy can be further configured to send the modified message to at least one of the user agent, a reverse proxy, or a third computing device. The post-quantum custom encryption and/or decryption can comprise Quantum Secure Layer (QSL), Post-Quantum Transport Layer Security (PQTLS), Kyber, SABER, Enhanced McEliece, RLCE, or a National Institute of Standards and Technology (NIST) candidate post-quantum algorithm.
Absstract of: US20260180791A1
Out-of-band quantum key distribution using cellular SMS can include receiving, from a user device, a client identifier that identifies the user device and a first key identifier that identifies a first key having a first key value that is a first quantumly generated random bit string. A second key that includes a second key value can be requested and received from the key service, the second key value including a second quantumly generated random bit string. The second key value can be provided to a short message service center for delivery to the user device. An operation can be performed on the first key value and the second key value to obtain a copy of a pre-shared key, which can be used when exchanging encrypted communications with the user device.
Absstract of: US20260180790A1
Provided here is a computer-implemented method, system and computing device for agreeing a final symmetric key between a first party and a second party, wherein the first party is configured to communicate with the second party, the method comprising: retrieving a plurality of key exchange algorithms or key encapsulation mechanisms wherein the plurality of key exchange algorithms or key encapsulation mechanisms are each different; agreeing a set of keys using the plurality of key exchange algorithms or key encapsulation mechanisms; using the agreed set of keys to obtain a final symmetric key, according to a combination scheme that specifies how each key of the set of keys is to be used to obtain the final symmetric key; and storing the final symmetric key at the first and second party.
Absstract of: WO2024261360A1
Pilot-tone-assisted demodulation procedure for coherent optical communication systems, specifically continuous-variable quantum key distribution (CV-QKD) systems, which allows compensation of random phase fluctuations in the lasers they use after acquiring the signal, solving the frequency-locking problem in a simple, efficient, and cost-effective manner.
Absstract of: WO2025061897A1
The invention relates to a monolithically integrated entropy source comprising: a photon source that is designed to emit photons, the photon source comprising a first outer shell, said first outer shell being formed by a first base surface, a first top surface, and at least one first side surface connecting the first base surface and the first top surface to one another; and a photon detector that is designed to detect the photons emitted by the photon source, the first base surface of the photon source being arranged so as to face the photon detector.
Absstract of: WO2025059384A1
Systems and methods are for seedless generation of random bit strings are disclosed. A System generates a secret key from a raw key received from a quantum source of randomness using a seedless randomness extractor that generates the secret key by applying a deterministic function on the raw key to transform the partially random raw bits into a near uniformly random output random bit string without using a seed random bit string. The system determines a Bell value quantifying violation of a Bell inequality by the raw bits. A distance between the secret key and a uniform random distribution is limited by an upper bound at least partially dependent on the determined Bell value.
Absstract of: EP4765717A1
According to an arrangement, a key management device (20) includes a generation unit (203), a packet processing unit (207), and an inter-node relay unit (209). The generation unit (203) is configured to generate a first global key based on a first random number. The packet processing unit (207) is configured to add, to a first packet including the first global key, first path information indicating a relay path for the first packet. The inter-node relay unit (209) is configured to encrypt the first packet with a local key shared with a different node and transmit the encrypted first packet to the different node.
Absstract of: EP4765722A1
0001 The present invention relates to a quantum key distribution receiver comprising a unique single detector adapted to detect qubits composed of low power optical pulses in specified time-bins, A being the Advanced time-bin and D being the Delayed time-bin, an interferometer with two unequal arms, one short arm (S) and one long arm (L) adapted to create an interference between the two successive time-bins A and D so as to create three time bins AS, AL&DS, DL, characterized in that said receiver is adapted to control the single detector so as to work in a gated mode, where he chooses when the detector is active and when it is not and to choose in which basis he will measure, such that for each qubit received and interfered by said interferometer, said receiver is adapted to activate its single detector for the DL and AS bins to measure in the Z basis, or to activate it for the AL&DS bin to measure in the X basis.
Absstract of: GB2632664A
A pair of pulses, of differing phase but identical polarisation, are generated 126, 127. The pulse pair is passed through a polarisation adjuster / polarisation controller 140 and then an interferometer 160. At the input to the interferometer a PBS splits each received pulse into orthogonal polarisation components (|Vn>, |Hn>). One arm of the interferometer includes a delay element which delays one of the polarisation components sufficiently to enable interference between two pulses of the pair. The interferometer outputs an interference pulse with a polarisation state 166 which is dependent on a phase difference ϕ1 between the input pulses. Different polarisation states can be coded by setting different phase differences ϕ1 , ϕ2 between input pulse pairs. The invention may be applied to quantum key distribution (QKD). Preferably a sequence of pulses is input to the interferometer. The pulses are preferably generated by injection locking a first laser diode 121 (which controls the phase difference between consecutive pulses) to a second laser diode 123, via a circulator 125.
Absstract of: EP4765716A1
The present invention relates to an apparatus and method of generating and sending a secret key (50), wherein the secret key (50) is homomorphically encrypted and wherein the secret key (50) is further homomorphically operated with a homomorphically encrypted quantum key (58). It is also related to an apparatus and method of relaying a secret key (50) wherein a key management module receives a homomorphic key (53), decrypts it obtaining a homomorphically encrypted first key (57) and then further encrypts it to send it along a next hop. It is also related to an apparatus and method of receiving a homomorphic key which contains a homomorphically encrypted secret key (57) which is decrypted obtaining the secret key (50).
Absstract of: WO2025061894A1
The invention relates to a controllable and/or self-controlling object comprising a monolithically integrated entropy source having: a photon source that is designed to emit photons, the photon source comprising a first outer shell, said first outer shell being formed by a first base surface, a first top surface, and at least one first side surface connecting the first base surface and the first top surface to one another; and a photon detector that is designed to detect the photons emitted by the photon source, the first base surface of the photon source being arranged so as to face the photon detector.
Absstract of: EP4765723A1
0001 A quantum key distribution control apparatus according to an embodiment may perform operations of: acquiring, from a first node belonging to a first node group managed by the quantum key distribution control apparatus, a request for quantum key distribution to a second node belonging to a second node group; acquiring information about an external quantum key distribution control apparatus for managing the second node; determining, within the first node group, a third node connectable to the second node; generating a first quantum key between the second node and the third node by requesting the external quantum key distribution control apparatus for quantum key distribution between the second node and the third node; moving a mobile node belonging to the first node group to the position of the third node to control generation of a first combined key in which the first quantum key is combined with a second quantum key between the mobile node and the third node; and moving the mobile node to the position of the first node to control generation of a second combined key in which the first combined key is combined with a third quantum key between the first node and the third node.
Nº publicación: CN122269278A 23/06/2026
Applicant:
NOKIA TECHNOLOGIES OY
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Absstract of: CN122269278A
The present disclosure relates to enhancement of post quantum cryptography (PQC) for authentication and key agreement (AKA) processes used in communication networks, in particular to PQC adaptation for 6G AKA processes. Aspects of the present disclosure include the use of a pre-shared post quantum key (PPK), or a PPK selected from a list of PPKs, or the use of a home network public key (pk) and a private key (sk) derived using a post quantum cryptography (PQC) key generation function to define a PQC-based pk and a PQC-based sk for an authentication process between a user equipment and a network entity. Aspects of the present disclosure also include the use of a PQC-based pk and a PQC-based sk for the generation of a shared PQC-based key.
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