The present invention relates to a vehicle black box technique and provides the advantage of guaranteeing the integrity of vehicle data stored in a black box in real time by forming input data streams as block data and performing a signature using a signature key and nested hashing. In addition, since each vehicle black box includes a reliable unique signature key, the present invention provides the advantage of supporting a non-repudiation function. Furthermore, the present invention provides the advantage of supporting an error correction function through a unique algorithm for generating integrity verification data even when an error occurs from the vehicle data.