VEHICLE, METHOD, and COMPUTER READABLE MEDIUM FOR PROVIDING SECURITY FUNCTION

A vehicle is configured to provide a security function using an electronic key. A method includes receiving a vehicle control signal through an antenna device of the vehicle, extracting a scrambled timestamp sequence (STS) field in the vehicle control signal, dividing the extracted STS field into sub-fields, each of which has a predefined certain length, performing cross-correlation calculation of the divided sub-fields and sub-templates previously stored in storage of the vehicle, extracting times of arrival of the vehicle control signal from the results of performing the cross-correlation calculation, and determining 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 determining the vehicle control signal as an abnormal signal when the consistency is less than the predefined reference value.