ILLEGAL MESSAGE DESTROYER

摘要

A communication apparatus for preventing the broadcasting of unauthorised messages on a broadcast bus network, the communication apparatus comprising:
a first memory adapted to store first information;a second memory adapted to store second information;a monitoring unit adapted to:
monitor the bus for processing messages being broadcasted on the bus, andoutput a third information and fourth informationa comparing unit adapted to compare the first information with the third information and the second information with the fourth information; and,a message destroyer adapted to:when:
the first information matches with the third information, andthe second information does not match with the fourth information,

causing the body of the current message to be altered while the current message is being broadcasted on the bus.

主权项

1. A communication apparatus for receiving and/or broadcasting authorised messages on a broadcast bus network and for preventing the broadcasting of unauthorised messages on the bus the authorised and unauthorised messages comprising a header and a body wherein the header is broadcasted before the body and comprises an indication of the type of message being broadcasted, the communication apparatus comprising:
a first memory adapted to store first information with respect to at least one type of authorised messages which can be broadcasted by the communication apparatus; a second memory adapted to store second information with respect to at least the last authorised message broadcasted by the communication apparatus; a monitoring unit coupled to the bus and adapted to:
monitor the bus for processing messages being broadcasted on the bus, andoutput a third information with respect to a type of a current message being broadcasted on the bus and fourth information with respect to at least part of the header of the current message; a comparing unit coupled to the monitoring unit, the first memory and the second memory, the comparing unit being adapted to compare the first information with the third information and the second information with the fourth information; and, a message destroyer coupled to the comparing unit and adapted to: when:
the first information matches with the third information, andthe second information does not match with the fourth information, convert the current message into an erroneous message by causing the body of the current message to be altered while the current message is being broadcasted on the bus.