Connection detection apparatus and in-vehicle relay apparatus
First Claim
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;
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 an unauthorized device has been connected to the communication line; and
a prohibition unit that prohibits relay processing with respect to the communication line, if connection of an unauthorized communication device to the communication line has been detected.
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Accused Products
Abstract
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.
7 Citations
10 Claims
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1. A connection detection apparatus comprising:
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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; 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 an unauthorized device has been connected to the communication line; and a prohibition unit that prohibits relay processing with respect to the communication line, if connection of an unauthorized communication device to the communication line has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An in-vehicle relay apparatus comprising:
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a communication relay unit that is connected to a plurality of communication lines via which a plurality of in-vehicle communication devices communicate with each other, and is configured to relay communication between the plurality of communication lines; waveform information acquiring units each configured to acquire waveform information on signals that are transmitted and received via a respective one of the communication lines; a waveform information storage unit that has stored therein waveform information on a predetermined signal for each communication line; and a connection detection unit configured to compare the waveform information acquired by the waveform information acquiring unit with the waveform information on a predetermined signal stored in the waveform information storage unit, and to detect, based on a comparison result, whether an unauthorized device has been connected to the corresponding communication line; and a prohibition unit that prohibits relay processing with respect to the corresponding communication line, if connection of an unauthorized communication device to the corresponding communication line has been detected.
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10. A connection detection method comprising;
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storing, in a storage unit, waveform information on a predetermined signal; acquiring waveform information on signals that are transmitted and received via a communication line via which a plurality of in-vehicle communication devices communicate with each other; comparing the acquired waveform information with the waveform information on the predetermined signal stored in the waveform information storage unit, and detecting, based on a comparison result, whether an unauthorized device has been connected to the communication line; and prohibiting relay processing with respect to the communication line, if connection of an unauthorized communication device to the communication line has been detected.
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Specification