CONNECTION DETECTION APPARATUS AND IN-VEHICLE RELAY APPARATUS

摘要

A connection detection apparatus in includes a gateway to which communication lines are connected, and which detects whether an unauthorized communication device has been connected to the communication lines. The gateway samples a signal several times from each of the communication lines, and generates waveform information, such as an eye pattern in which the waveforms are superimposed on one another. Furthermore, the gateway has stored therein normal waveform information, such as a mask generated based on the eye pattern at normal times. The gateway compares the generated waveform information with the stored waveform information, and recognizes that the waveform information is abnormal if it does not sufficiently match the normal waveform information. If the waveform information is abnormal, it is determined that an unauthorized communication device has been connected to one or more of the communication lines.

主权项

1. A connection detection apparatus comprising:
a waveform information acquiring unit that is connected to a communication line via which a plurality of in-vehicle communication devices communicate with each other, and is configured to acquire waveform information on signals that are transmitted and received via the communication line; a waveform information storage unit that has stored therein waveform information on a predetermined signal; and a connection detection unit configured to compare the waveform information acquired by the waveform information acquiring unit with the waveform information on the predetermined signal stored in the waveform information storage unit, and to detect, based on a comparison result, whether a device has been connected to the communication line.