公开(公告)号：US11316677B2

公开(公告)日：2022-04-26

申请号：US17069073

申请日：2020-10-13

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Haeng-Seok Ko ,  Se Wan Ji ,  Younchang Jeong ,  Osung Kwon ,  Seok Kim ,  Eun Ji Kim ,  Changho Hong ,  Jingak Jang ,  Daesung Kwon

IPC: H04L9/06 ,  H04L9/08 ,  H04L9/14 ,  H04L9/12

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.

公开(公告)号：US11187578B1

公开(公告)日：2021-11-30

申请号：US16933261

申请日：2020-07-20

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

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.

公开(公告)号：US10958439B2

公开(公告)日：2021-03-23

申请号：US16183934

申请日：2018-11-08

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Changho Hong ,  Nayoung Kim ,  Osung Kwon ,  Se Wan Ji ,  Haeng-Seok Ko ,  Jingak Jang ,  Daesung Kwon

IPC: H04L29/06 ,  H04L9/32 ,  H04L9/06 ,  G06N10/00

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.

公开(公告)号：US10958428B2

公开(公告)日：2021-03-23

申请号：US15350376

申请日：2016-11-14

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Chang-Ho Hong ,  Na-Young Kim ,  O-Sung Kwon ,  Youn-Chang Jeong ,  Haeng-Seok Ko ,  Jin-Gak Jang ,  Dae-Sung Kwon

IPC: H04L9/08 ,  H04L9/00

Abstract: A device and method for quantum key distribution (QKD). The QKD center includes an authentication key sharing unit for sharing authentication keys with QKD client devices; a quantum key generation unit for generating a sifted key for each of the QKD client devices using a quantum state; an error correction unit for generating output bit strings by correcting errors of the sifted keys; and a bit string operation unit for calculating an encryption bit string by performing a cryptographic operation on the authentication keys, the distribution output bit strings and output bit strings received from the QKD client devices. The present invention improves security by preventing the QKD center from being aware of keys shared among users.

公开(公告)号：US10778420B2

公开(公告)日：2020-09-15

申请号：US15980919

申请日：2018-05-16

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Changho Hong ,  Nayoung Kim ,  Osung Kwon ,  Se Wan Ji ,  Haeng-Seok Ko ,  Jingak Jang ,  Daesung Kwon

IPC: H04L9/08 ,  H04L9/32 ,  G06N99/00 ,  G06N10/00

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.

公开(公告)号：US10887094B2

公开(公告)日：2021-01-05

申请号：US16041994

申请日：2018-07-23

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

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.

公开(公告)号：US10567169B2

公开(公告)日：2020-02-18

申请号：US15434188

申请日：2017-02-16

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Changho Hong ,  Nayoung Kim ,  Osung Kwon ,  Younchang Jeong ,  Haeng-Seok Ko ,  Jingak Jang ,  Daesung Kwon

IPC: H04L9/08 ,  H04L9/14

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.