Abstract: A method for detecting an attack on a serial communications system which determines the status of messages transmitted via the serial communications system to obtain a sequence of statuses, compares the sequence of statuses with at least one reference sequence, and determines that there is an attack on the serial communications system in response to the sequence of statuses deviating from the reference sequence. The status of one of the messages is based on properties of the message and properties of a preceding message.

Abstract: Technologies and techniques for monitoring a communication bus. A number of electronic stations are networked by the communication bus. During operations, the messages transmitted via the communication bus are identified via an identifier, it being determined for each station which messages each station can send with which identifier. According to a uniqueness rule, it is prohibited for another station to send a payload message with an identifier that is already reserved for this station. In order to expose stations that introduce manipulated messages onto the communication bus, a protocol unit in a station maintains a list of the identifiers of the messages actually sent by the station. The attacker station can be identified via subsequent comparisons with this list.

Abstract: The present invention relates to a method for transmitting a message sequence via a data bus. The method comprises the transmission of an informational message containing an informational signal during an active phase, the transmission of a security message for initiating a rest phase and the transmission of rest messages containing a rest signal at the interval of a rest cycle time during the rest phase, wherein the informational signal and the rest signal differ from each other and wherein the security message and the rest messages differ from each other. Furthermore, the invention relates to a device for transmitting a message sequence via a data bus as well as a method and a device for detecting an attack on a message sequence transmitted via a data bus.

Abstract: A method for detecting an attack on a serial communications system which determines the status of messages transmitted via the serial communications system to obtain a sequence of statuses, compares the sequence of statuses with at least one reference sequence, and determines that there is an attack on the serial communications system in response to the sequence of statuses deviating from the reference sequence. The status of one of the messages is based on properties of the message and properties of a preceding message.