Patent ID: 6920379

Claim:
A vehicle-onboard dedicated short-range communication (DSRC) apparatus comprising: a DSRC processing unit that processes a radio communication signal transmitted by DSRC; an electronic toll collection (ETC) processing unit that performs transactions of an ETC command and ETC data included in the radio communication signal communicated with the DSRC processing unit; and a security module including a security processing unit including an encryption/decryption unit for performing encryption/decryption of the ETC data included in a communication signal transmitted between the ETC processing unit and an IC card with user information held therein, a host interface for communication between the security processing unit and the ETC processing unit, and an IC card interface for communication between the security processing unit and the IC card, wherein the security processing unit further includes: a command judgment unit for judging a type of command included in a communication signal transmitted between the ETC processing unit and the IC card, and a command control unit for controlling whether the command is to be analyzed, according to a result of judgment by the command judgment units wherein the command judgment unit judges whether the command included in the communication signal transmitted between the ETC processing unit and the IC card is an ETC command; and the command control unit transmits an execution command obtained by analyzing the ETC command to the IC card when the command judged by the command judgment unit is the ETC command, and when the command judged by the command judgment unit is an undefined command that is not the ETC command, transmits the undefined command to the IC card without being analyzed.