Communication security method and apparatus of first node and second node communicating based on full duplex communication scheme using near field

A communication security method of a second node, the communication security method comprising:

• transmitting first information to a first node at a previous time, the previous time being recognized by the first node and the second node;
• receiving encrypted second information from the first node at a next time;
• and
• decrypting the encrypted second information using the first information and information on the previous time.

A communication security apparatus of a first node, the communication security apparatus comprising:

• a receiving unit configured to receive first information from a second node at a previous time, wherein the previous time is recognized by the first node and the second node;
• an encrypting unit configured to encrypt second information using the first information and information on the previous time;
• and
• a transmitting unit configured to transmit the encrypted second information to the second node at a next time.

A communication security apparatus of a second node, the communication security apparatus comprising:

• a transmitting unit configured to transmit first information to a first node at a previous time, wherein the previous time is recognized by the first node and the second node;
• a receiving unit configured to receive encrypted second information from the first node at a next time;
• and
• a decrypting unit configured to decrypt the encrypted second information using the first information and information on the previous time.

A computer program embodied on a non-transitory computer readable medium, the computer program being configured to control a processor of a first node to perform:

• receiving first information from a second node at a previous time, the previous time being recognized by the first node and the second node;
• encrypting second information using the first information and information on the previous time;
• and
• transmitting the encrypted second information to the second node at a next time.

A computer program embodied on a non-transitory computer readable medium, the computer program being configured to control a processor of a second node to perform:

• transmitting first information to a first node at a previous time, the previous time being recognized by the first node and the second node;
• receiving encrypted second information from the first node at a next time;
• and
• decrypting the encrypted second information using the first information and information on the previous time.