Mobile commerce and authentication method having improved security based on quantum cryptography

A server for quantum cryptography communication, the server comprising:

• a quantum signal generation unit configured to generate a series of first quantum signals by using a first quantum filter;
• an optical communication unit configured to send the first quantum signals to a communication device;
• a processor configured to:
• select setup of the first quantum filter based on a series of randomly generated first quantum states;
• control the quantum signal generation unit to generate the first quantum signals by using the first quantum filter;
• and
• control the optical communication unit to adjust signal strength of the first quantum signals based on a condition of communication with the communication device;
• randomly generate the first quantum states based on random numbers;
• send information about the first quantum filter to the communication device;
• receive information about a second quantum filter used for generation of second quantum signals from the first quantum signals by the communication device;
• generate a secret key in conjunction with the communication device by using the information about the first quantum filter and the information about the second quantum filter;
• and
• perform user authentication in conjunction with the communication device by using the secret key.

A quantum cryptography authentication method for a communication device, the method comprising:

• randomly generating a series of first quantum states based on random numbers;
• selecting a first quantum filter generating a series of first quantum signals based on the first quantum states;
• generating the first quantum signals by setting up the first quantum filter in a reception path for a series of second quantum signals generated and sent by a server;
• receiving the first quantum signals generated by passing through the first quantum filter;
• sending information about the first quantum filter to the server, and receiving information about a second quantum filter used for the generation of the second quantum signals by the server;
• generating a secret key in conjunction with the server by using the information about the first quantum filter and the information about the second quantum filter;
• and
• performing user authentication in conjunction with the server by using the secret key.

A quantum cryptography authentication method for a server, the method comprising:

• randomly generating a series of first quantum states based on random numbers;
• selecting setup of a first quantum filter based on the first quantum states;
• generating a series of first quantum signals by using the first quantum filter;
• adjusting signal strength of the first quantum signals based on a condition of communication with a communication device;
• sending the first quantum signals to the communication device;
• sending information about the first quantum filter to the communication device, and receiving information about a second quantum filter used for generation of second quantum signals from the first quantum signals by the communication device;
• generating a secret key in conjunction with the communication device by using the information about the first quantum filter and the information about the second quantum filter;
• and
• performing user authentication in conjunction with the communication device by using the secret key.