Vehicle, method, and computer readable medium for providing security function

A method comprising:

• receiving, by a processor, a vehicle control signal through an antenna device of a vehicle;
• extracting, by the processor, a scrambled timestamp sequence (STS) field in the vehicle control signal;
• dividing, by the processor, the extracted STS field into sub-fields, each of which has a predefined certain length;
• dividing, by the processor, a local template previously stored in a storage into a plurality of sub-templates in response to the lengths of the divided sub-fields;
• performing, by the processor, a cross-correlation calculation of the sub-fields divided from the extracted STS field and the plurality of sub-templates divided from the local template;
• extracting, by the processor, times of arrival of the vehicle control signal from the results of performing the cross-correlation calculation;
• determining, by the processor, whether the received vehicle control signal is normal based on the times of arrival;
• and
• controlling, by the processor, to unlock a door lock of the vehicle, turn on the vehicle, or turn on an air circulation device of the vehicle in response to the received vehicle control signal, when the vehicle control signal is normal.

A non-transitory computer readable medium containing program instructions executed by a processor, the computer readable medium comprising:

• program instructions that receive a vehicle control signal through an antenna device of a vehicle;
• program instructions that extract a scrambled timestamp sequence (STS) field in the vehicle control signal;
• program instructions that divide the extracted STS field into sub-fields, each of which has a predefined certain length;
• program instructions that divide a local template previously stored in a storage into a plurality of sub-templates in response to the lengths of the divided sub-fields;
• program instructions that perform a cross-correlation calculation of the sub-fields divided from the extracted STS field and the plurality of sub-templates divided from the local template;
• program instructions that extract times of arrival of the vehicle control signal from the results of performing the cross-correlation calculation;
• program instructions that determine the vehicle control signal as a normal signal when consistency of distribution locations of the times of arrival in the results of performing the cross-correlation calculation is greater than or equal to a predefined reference value and determine the vehicle control signal as an abnormal signal when the consistency is less than the predefined reference value;
• program instructions that invalidate the received vehicle control signal, when the vehicle control signal is the abnormal signal;
• and
• program instructions that control to unlock a door lock of the vehicle, turn on the vehicle, or turn on an air circulation device of the vehicle in response to the received vehicle control signal, when the vehicle control signal is the normal signal.