公开(公告)号：US20190123896A1

公开(公告)日：2019-04-25

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

CPC classification number: H04L9/0852 ,  G06N10/00 ,  H04L9/0869 ,  H04L9/32 ,  H04L9/3228

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：US20180069698A1

公开(公告)日：2018-03-08

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

CPC classification number: H04L9/0858 ,  H04L9/083 ,  H04L9/0869 ,  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.

公开(公告)号：US20210266157A1

公开(公告)日：2021-08-26

申请号：US16887170

申请日：2020-05-29

Applicant: Electronics and Telecommunications Research Institute

Inventor： Changho HONG ,  Nayoung KIM ,  Osung KWON ,  Younchang JEONG ,  Se Wan JI ,  Eun Ji KIM ,  Seok KIM ,  Jingak JANG ,  Daesung KWON

IPC: H04L9/08 ,  H04B10/70

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.

公开(公告)号：US20200313879A1

公开(公告)日：2020-10-01

申请号：US16554850

申请日：2019-08-29

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Changho HONG ,  Nayoung KIM ,  Osung KWON ,  Younchang JEONG ,  Se Wan JI ,  Jingak JANG ,  Daesung KWON

IPC: H04L9/08 ,  G06N10/00

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.

公开(公告)号：US20190327095A1

公开(公告)日：2019-10-24

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: H04L9/32 ,  G06N99/00 ,  H04L9/06

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.