Communication method for quantum direct communication and quantum direct communication system

A communication method for quantum direct communication, applied to a sender of a quantum direct communication system, comprising:

• encrypting a transmitted message using an encryption algorithm to obtain a ciphertext corresponding to the transmitted message;
• encoding the ciphertext into a quantum state through a quantum direct communication terminal of the sender according to a quantum communication protocol;
• and
• sending the quantum state to a receiver of the quantum direct communication system.

A quantum direct communication system, comprising a sender and a receiver, wherein the sender comprises:

• an encryption device configured to encrypt a transmitted message using an encryption algorithm to obtain a ciphertext corresponding to the transmitted message;
• and
• a first quantum direct communication terminal configured to encode the ciphertext into a quantum state according to a quantum communication protocol and send the quantum state to the receiver of the quantum direct communication system;
• and
• the receiver comprises:
• a second quantum direct communication terminal configured to measure a quantum state sent from the sender to obtain a ciphertext corresponding to the transmitted message, the ciphertext being obtained by the sender encrypting the transmitted message using an encryption algorithm;
• a decryption device configured to perform decryption using a decryption algorithm corresponding to the encryption algorithm to obtain the transmitted message.

A quantum direct communication system, comprising a first quantum direct communication terminal and a second quantum direct communication terminal, wherein

• the first quantum direct communication terminal comprises an encryption module and a message sending module,
• the encryption module is configured to encrypt a transmitted message using an encryption algorithm to obtain a ciphertext corresponding to the transmitted message,
• the message sending module is configured to encode the ciphertext into a quantum state according to a quantum communication protocol and send the quantum state to the second quantum direct communication terminal,
• the second quantum secure direct communication terminal comprises a message receiving module and a decryption module,
• the message receiving module is configured to measure the quantum state sent from the first quantum secure direct communication terminal to obtain a ciphertext corresponding to the transmitted message, the ciphertext being obtained by the encryption module of the first quantum direct communication terminal encrypting the transmitted message using the encryption algorithm, and
• the decryption module is configured to perform decryption using a decryption algorithm corresponding to the encryption algorithm to obtain the transmitted message.