NETWORK DEVICE, AND DATA SENDING AND RECEIVING SYSTEM

摘要

In order to detect and prevent attacks in which the network is infested with unauthorized data to cause malfunction, the invention aims, on the basis of network cycle information, to detect errors and to prevent unauthorized data forwarding in a network system such as a vehicle-mounted network. This network device is provided with a communication unit which receives data, a time management unit which manages the reception time at which data is received, and a control unit which processes data. If, for received data used as a reference, first data is received having the same identifier and a reception interval shorter than a prescribed cycle, the control unit waits to receive data having the same identifier as the first data from the reception time of the received data used as a reference up until the prescribed cycle has elapsed, and if during this interval second data is received having the same identifier as the first data, the control unit determines that an error has occurred and performs cycle abnormality detection processing (see FIG. 1).

主权项

1. A network device which periodically receives and processes the data, comprising:
a communication unit that receives data; a time management unit that manages a reception time at which the data is received; and a control unit that processes the received data, wherein the control unit records the reception time in the time management unit for each identifier included in the data received by the communication unit, and wherein if first data having the same identifier as data being a reference is received for which an interval for receiving the data is shorter than a predetermined cycle,
when second data having the same identifier as the first data is received until the predetermined cycle has elapsed from a time of receiving the data being a reference, the control unit performs a process occurring when cycle abnormality is detected, andwhen data having the same identifier as the first data is not received until the predetermined cycle has elapsed, the control unit performs a predetermined process on the first data.