Method for securing discovery information and device therefor

A method for receiving a discovery message by a receiver in a device-to-device (D2D) communication system, the method comprising:

• receiving the discovery message including security information generated based on first coordinated universal time (UTC) information associated with a time in which the discovery message is received;
• generating second UTC information based on a predetermined number of least significant bits of the first UTC information transmitted along with the discovery message;
• and
• transmitting information included in the discovery message and the second UTC information to a server.

A method by a server, the method comprising:

• receiving information included in a discovery message which is transmitted from a transmitter to a receiver and first coordinated universal time (UTC) information associated with a time from the receiver of a device-to-device (D2D) communication system, the discovery message being transmitted in the time;
• and
• verifying security information included in the discovery message,
• wherein the first UTC information is generated by the receiver based on a predetermined number of least significant bits of second UTC information which is transmitted from the transmitter to the receiver.

A transmitter in a device-to-device (D2D) communication system for transmitting a discovery message, the transmitter comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• identify coordinated universal time (UTC) information, the UTC information being associated with a time in which the discovery message is transmitted,
• generate the discovery message including discovery information associated with a security key and security information which is calculated based on the identified UTC information and the security key, and
• control the transceiver to transmit the discovery message,
• wherein the security information is calculated based on the identified UTC information, the security key, and the discovery information.

A receiver in a device-to-device (D2D) communication system for receiving a discovery message, the receiver comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• control the transceiver to receive the discovery message including security information generated based on first coordinated universal time (UTC) information associated with a time in which the discovery message is received,
• generate second UTC information based on a predetermined number of least significant bits of the first UTC information transmitted along with the discovery message, and
• control the transceiver to transmit information included in the discovery message and the second UTC information to a server.

A server, the server comprising:

• a controller configured to:
• control a transceiver to receive information included in a discovery message which is transmitted from a transmitter to a receiver and first coordinated universal time (UTC) information associated with a time from the receiver of a device-to-device (D2D) communication system, the discovery message being transmitted in the time, and
• verify security information included in the discovery message,
• wherein the first UTC information is generated by the receiver based on a predetermined number of least significant bits of second UTC information which is transmitted from the transmitter to the receiver.