Secure payment and authentication system having security function enhanced by using quantum cryptography

Patent metadata

Field	Value
Publication number	US-10637660-B2
Application number	US-201715655485-A
Country	US
Kind code	B2
Filing date	Jul 20, 2017
Priority date	Jan 23, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

Disclosed herein are a quantum cryptography-based cryptographic communication system and an authentication, payment and transaction system via a relay device between a communication device and a server. A relay device for quantum cryptography authentication includes an optical receiver unit, an optical transmission unit, and a processor. The processor includes a quantum signal control unit, a user authentication unit, and a random number generation unit. The optical receiver unit receives a series of second quantum signals generated in such a manner that a series of first quantum signals generated by a first quantum filter and sent from a communication device pass through the second quantum filter of the relay device or a reception side, and the optical transmission unit transfers the series of second quantum signals to a server.

First claim

What is claimed is:

1. A relay device for quantum cryptography authentication, the relay device comprising:
an optical receiver configured to generate a series of second quantum signals by receiving a series of first quantum signals using a second quantum filter, the series of first quantum signals generated by being transmitted using a first quantum filter from a communication device, and passing through a first quantum channel between the communication device and the relay device;
an optical transmitter configured to transmit the series of second quantum signals using the second quantum filter to a server that generates a series of third quantum signals by receiving the series of second quantum signals using a third quantum filter, the second quantum signals passing through a second quantum channel between the relay device and the server, wherein the series of second quantum signals are generated such that at least a part of the series of first quantum signals pass through the second quantum filter at the relay and are transferred to the server via the second quantum channel, pass through the second quantum channel, and reach the server; and
a processor configured to:
control quantum signal generation characteristics of the optical receiver and the optical transmitter based on information of the second quantum filter;
share the information of the second quantum filter with the communication device and the server via a non-quantum channel, receive information of the third quantum filter from the server via the non-quantum channel, and share the information of the third quantum filter with the communication device; and
generate a first secret key by applying information of the first quantum filter, the second quantum filter, and the third quantum filter to the series of second quantum signals, wherein the first secret key is the same as a second secret key generated by the communication device applying the information of the first quantum filter, the second quantum filter, and the third quantum filter to the series of first quantum signals, and wherein the first secret key is the same as a third secret key generated by the server applying the information of the first quantum filter, the second quantum filter, and the third quantum filter to the series of third quantum signals; and
perform user authentication in conjunction with the communication device and the server by using the first secret key.

2. The relay device of claim 1 , wherein:
the processor is further configured to randomly generate a series of quantum states based on random numbers;
generate the information about the second quantum filter based on the series of quantum states generated by a random number generator; and
transfer information about whether the user authentication is successful to the server.

3. The relay device of claim 1 , wherein the series of first quantum signals pass through the first quantum channel by using a free-space optical communication.

4. The relay device of claim 1 , wherein the optical transmitter is configured to:
transfer the series of second quantum signals to the server by using an optical cable; or
transfer the series of second quantum signals to the server by using a free-space optical communication.

5. The relay device of claim 4 , wherein the optical transmitter is further configured to transfer the series of second quantum signals to the server via a satellite relay device by using a free-space optical communication.

6. A relay device for quantum cryptography communication, the relay device comprising:
an optical receiver configured to generate a series of second quantum signals by receiving a series of first quantum signals using a second quantum filter, the series of first quantum signals generated by being transmitted from a communication device using a first quantum filter and passing through a first quantum channel between the communication device and the relay device;
an optical transmitter configured to transmit the series of second quantum signals using the second quantum filter to a server, wherein the second quantum signals are generated such that at least a part of the series of first quantum signals pass through a second quantum channel between the relay device and the server and reach the server, and wherein the series of second quantum signals are generated such that at least the part of the series of first quantum signals pass through the second quantum filter at the relay and are transferred to the server via the second quantum channel, pass through the second quantum channel, and reach the server; and
a processor configured to:
identify information of the first quantum filter received from the communication device;
receive information of the second quantum filter from the server via a non-quantum channel;
control the optical receiver to generate the series of second quantum signals by receiving the series of first quantum signals using the second quantum filter based on the information of the second quantum filter received from the server;
control the optical transmitter to transmit the series of second quantum signals to the server using the second quantum filter based on the information of the second quantum filter received from the server;
generate a secret key in conjunction with the communication device based on the information of the first quantum filter and the information of the second quantum filter; and
perform user authentication in conjunction with the communication device by using the secret key.

7. The relay device of claim 6 , wherein the series of first quantum signals pass through the first quantum channel by using a free-space optical communication.

8. The relay device of claim 6 , wherein the optical transmitter is further configured to:
transfer the series of second quantum signals to the server by using an optical cable; or
transfer the series of second quantum signals to the server by using a free-space optical communication.

9. The relay device of claim 8 , wherein the optical transmitter is configured to transfer the series of second quantum signals to the server via a satellite relay device by using a free-space optical communication.

10. A relay method for quantum cryptography authentication, the relay method comprising:
generating, by an optical receiver, a series of second quantum signals by receiving a series of first quantum signals using a second quantum filter, the series of first quantum signals generated by being transmitted using a first quantum filter from a communication device, and passing through a first quantum channel between the communication device and the relay device;
transmitting, by an optical transmitter, the series of second quantum signals using the second quantum filter to a server that generates a series of third quantum signals by receiving the series of second quantum signals using a third quantum filter, the second quantum signals passing through a second quantum channel between the relay device and the server, wherein the series of second quantum signals are generated such that at least a part of the series of first quantum signals pass through the second quantum filter at the relay and are transferred to the server via the second quantum channel, pass through the second quantum channel, and reach the server;
controlling, by a processor, quantum signal generation characteristics of the optical receiver and the optical transmitter based on information of the second quantum filter;
sharing, by the processor, the information of the second quantum filter with the communication device and the server via a non-quantum channel, receiving information of the third quantum filter from the server via the non-quantum channel, and s

Assignees

• Univ Seoul Ind Coop Found

Inventors

• Ahn Do Yeol

Classifications

• H04L9/3226

  using a predetermined code, e.g. password, passphrase or PIN (network architectures or network communication protocols for supporting authentication of entities using passwords in a packet data network H04L63/083) · CPC title

• H04L9/0852 Primary

  Quantum cryptography (transmission systems employing electromagnetic waves other than radio waves, e.g. light, infrared H04B10/00; wavelength-division multiplex systems H04J14/02; WDM arrangements H04J14/03) · CPC title

• H04L9/0869

  involving random numbers or seeds · CPC title

• G06Q20/38215

  Use of certificates or encrypted proofs of transaction rights · CPC title

• H04L9/30

  Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy · CPC title