Method for carrying out user authentication by applying pre-shared key to basis selection in quantum communication system, and device therefor

A transmitting end that carries out user authentication in a quantum communication system, the transmitting end comprising:

• a transmitter for transmitting a wireless signal;
• a receiver for receiving a wireless signal;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor, and storing instructions that, when executed by the at least one processor, perform operations,
• the operations comprising:
• on the basis of a pre-shared key, generating authentication quantum information by encoding an authentication message for user authentication,
• wherein a basis, for encoding each bit element constituting the authentication message, the respective bit elements corresponding to the respective positions of bit elements constituting the pre-shared key, is determined on the basis of respective bit values of the bit elements constituting the pre-shared key;
• transmitting the authentication quantum information to a receiving end via a quantum channel;
• receiving, from the receiving end, authentication quantum information measurement information related to a value derived by means of the receiving end measuring the authentication quantum information;
• and
• carrying out user authentication with the receiving end on the basis of the authentication quantum information measurement information.

A method for a receiving end to carry out user authentication in a quantum communication system, the method comprising:

• receiving, from a transmitting end, authentication quantum information generated by encoding an authentication message for user authentication on the basis of a pre-shared key,
• wherein a basis, for encoding each bit element constituting the authentication message, the respective bit elements corresponding to the respective positions of bit elements constituting the pre-shared key, is determined on the basis of respective bit values of the bit elements constituting the pre-shared key;
• receiving the authentication quantum information from the transmitting end via a quantum channel;
• measuring the received authentication quantum information on the basis of the pre-shared key,
• wherein a measurement basis, for measuring each bit element constituting the received authentication quantum information, the respective bit elements corresponding to the respective positions of bit elements constituting the pre-shared key, is determined on the basis of respective bit values of the bit elements constituting the pre-shared key;
• transmitting, to the transmitting end, authentication quantum information measurement information related to a value derived by means of the receiving end measuring the authentication quantum information;
• and
• carrying out user authentication with the transmitting end on the basis of the authentication quantum information measurement information.