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公开(公告)号：US11187578B1
公开(公告)日：2021-11-30
申请号：US16933261
申请日：2020-07-20
Inventor： Seok Kim , Eun Ji Kim , Younchang Jeong , Osung Kwon , Changho Hong , Se Wan Ji , Haeng-Seok Ko , Jingak Jang , Daesung Kwon
IPC: G01J1/44
Abstract: A single-photon detection method and apparatus. The single-photon detection method detects a single photon using a single-photon detection apparatus, and includes generating an output signal through a photon detector by receiving a light signal as an input, generating a negative voltage comparison result through a negative voltage comparator by receiving the output signal as an input, and generating a photon detection result based on the negative voltage comparison result.
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2.发明授权公开(公告)号：US10778420B2
公开(公告)日：2020-09-15
申请号：US15980919
申请日：2018-05-16
Inventor： Changho Hong , Nayoung Kim , Osung Kwon , Se Wan Ji , Haeng-Seok Ko , Jingak Jang , Daesung Kwon
Abstract: A quantum direct communication with user authentication and an apparatus using the same. The quantum direct communication method includes performing verification of security of a quantum channel using a preset channel verification probability and a quantum state source generated by a receiver of quantum direct communication, performing user authentication using one or more of a preset user authentication probability, the quantum state source, and an authentication key shared between the receiver and a sender, stopping quantum direct communication and resetting the quantum channel when the verification of security of the quantum channel fails, and stopping quantum direct communication when the user authentication fails.
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公开(公告)号：US10958439B2
公开(公告)日：2021-03-23
申请号：US16183934
申请日：2018-11-08
Inventor： Changho Hong , Nayoung Kim , Osung Kwon , Se Wan Ji , Haeng-Seok Ko , Jingak Jang , Daesung Kwon
Abstract: An apparatus and method for a reliable quantum signature. The method using the apparatus for a reliable quantum signature includes preparing a quantum signature by sharing a first secret key and a first Bell state with a signer's terminal device and by sharing a second secret key and a second Bell state with a verifier's terminal device; signing, by the signer's terminal device, a message with the quantum signature using a first encoding value, the first secret key, and the first Bell state; verifying, by the apparatus, the quantum signature of the message using the first encoding value, the first secret key, and the first Bell state; and finally verifying, by the apparatus, the quantum signature of the message using the verifier's terminal device, a second encoding value, a third encoding value, the second secret key, and the second Bell state.
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公开(公告)号：US09709657B2
公开(公告)日：2017-07-18
申请号：US14466976
申请日：2014-08-23
Inventor： YoungHyoun Kwon , JiEun Choi , HuiRae Cho , Jaeki Lee , Heesun Park , Jingak Jang , Jinhyun Kim , Jieun Kim , Inho Hwang
CPC classification number: G01S3/14
Abstract: An apparatus and method for estimating a direction of an RF signal are provided. The apparatus includes an antenna unit, a preliminary correction unit, a signal processing unit, a conversion unit, and a signal direction estimation unit. The antenna unit receives an RF signal from at least one antenna. The preliminary correction unit performs preliminary correction depending on whether the at least one antenna is an antenna having directional gain. The signal processing unit generates an analog signal by performing a frequency shift on the RF signal or a signal on which the preliminary correction has been performed. The conversion unit converts the analog signal into a digital sample. The signal direction estimation unit extracts the phase of the antenna from the digital sample, and estimates the direction of the RF signal based on the extracted phase.
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Patent Agency Ranking
公开(公告)号：US10887094B2
公开(公告)日：2021-01-05
申请号：US16041994
申请日：2018-07-23
Inventor： Se Wan Ji , Changho Hong , Younchang Jeong , Osung Kwon , Haeng-Seok Ko , Jingak Jang , Daesung Kwon
IPC: H04L9/08
Abstract: An authentication apparatus and method for quantum cryptography communication. The quantum cryptography communication authentication method is performed using quantum cryptography communication authentication apparatuses, and includes transmitting, by a first quantum cryptography communication authentication apparatus, a quantum state to a second quantum cryptography communication authentication apparatus by selecting a first basis, and measuring, by the second quantum cryptography communication authentication apparatus, the quantum state by selecting a second basis, and performing, by the first quantum cryptography communication authentication apparatus and the second quantum cryptography communication authentication apparatus, authentication by revealing the first basis and the second basis and by comparing sifted keys generated from a common basis between the first basis and the second basis with each other.
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公开(公告)号：US10567169B2
公开(公告)日：2020-02-18
申请号：US15434188
申请日：2017-02-16
Inventor： Changho Hong , Nayoung Kim , Osung Kwon , Younchang Jeong , Haeng-Seok Ko , Jingak Jang , Daesung Kwon
Abstract: An apparatus and method for multi-user quantum key distribution. The method for multi-user quantum key distribution is performed using a multi-user quantum key distribution apparatus and a quantum key client device, and includes generating, by the multi-user quantum key distribution apparatus, transmission qubit pairs based on a key bit string of a shared key to be distributed to the quantum key client device, measuring, by the quantum key client device, the transmission qubit pairs, received from the multi-user quantum key distribution apparatus through a quantum channel, based on a measurement basis, verifying security of the quantum channel using the transmission qubit pairs, and if the security has been verified, decoding qubit measurement values of the transmission qubit pairs into the shared key.
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公开(公告)号：US11736280B2
公开(公告)日：2023-08-22
申请号：US16887170
申请日：2020-05-29
Inventor： Changho Hong , Nayoung Kim , Osung Kwon , Younchang Jeong , Se Wan Ji , Eun Ji Kim , Seok Kim , Jingak Jang , Daesung Kwon
CPC classification number: H04L9/0852 , H04B10/70 , H04L9/0819
Abstract: A quantum entity authentication apparatus and method. The quantum entity authentication apparatus includes a quantum state preparation unit for preparing an authentication quantum state that is generated based on an authentication key previously shared with an entity, a quantum channel verification unit for transmitting a quantum state, generated by performing an operation using a prestored unique operator on the authentication quantum state, to a quantum measurement device, and for verifying security of a quantum channel by using a result of Bell measurement and the authentication quantum state, the result of Bell measurement being revealed by the quantum measurement device for the quantum state, and a quantum entity authentication unit for, when the security of the quantum channel is verified, authenticating the entity using the result of the Bell measurement and the unique operator.
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公开(公告)号：US11533171B2
公开(公告)日：2022-12-20
申请号：US16554850
申请日：2019-08-29
Inventor： Changho Hong , Nayoung Kim , Osung Kwon , Younchang Jeong , Se Wan Ji , Jingak Jang , Daesung Kwon
Abstract: An apparatus and method for quantum direct communication using single qubits. The apparatus includes a quantum state preparation unit for preparing quantum states including a message state prepared using pairs of single qubits based on a bit of a message to be sent to a communication partner, an authentication state prepared using random qubit pairs, and a verification state prepared using random qubit pairs, a quantum state communication unit for transmitting the quantum states to the communication partner and measuring a quantum state of a message received from the communication partner, an authentication unit for authenticating, using the authentication state, the communication partner depending on whether an authentication key previously shared with the communication partner is possessed, a verification unit for verifying security of a quantum channel using the verification state, and a message restoration unit for restoring the received message using the message state.
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公开(公告)号：US11316677B2
公开(公告)日：2022-04-26
申请号：US17069073
申请日：2020-10-13
Inventor： Haeng-Seok Ko , Se Wan Ji , Younchang Jeong , Osung Kwon , Seok Kim , Eun Ji Kim , Changho Hong , Jingak Jang , Daesung Kwon
Abstract: A quantum key distribution (QKD) node apparatus and a QKD method therein. The QKD node apparatus may include a QKD module for generating quantum keys and quantum key IDs, a quantum key synchronization management module for storing the quantum keys and the quantum key IDs as outbound and inbound quantum keys in a distributed manner and sharing the outbound and inbound quantum keys with a second QKD node apparatus, and a quantum key orchestration module for delivering a master key and a master key ID to a secure application connected therewith in response to a request for the master key with the ID of a second secure application and delivering a packet including the master key encrypted with the outbound quantum key shared with the second QKD node apparatus, the master key ID, and a quantum key ID, to the second QKD node apparatus.
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