Method for protecting a network against a cyberattack

A device for protecting a network having multiple network subscribers against a cyberattack, comprising:

• a device configured to perform the following:
• analyzing bits or bit sequences of a message;
• determining, based on the analysis, characteristic modifications for transmitting the bits or bit sequences of the message;
• and
• after the determining, transmitting the bits or bit sequences of the message between the network subscribers in the network via different voltage levels on at least one transmission route of the network;
• wherein at least one characteristic of the voltage levels or of the transmitted bits or bit sequences is actively modified in at least one of the network subscribers or on the at least one transmission route, the origin of the transmitted bit or of the transmitted bit sequence is determined by the at least one network subscriber or the at least one transmission route based on the at least one characteristic, and the cyberattack is detected or the cyberattack on the network is localized in the network as a function of the ascertained origin;
• and
• wherein the active modification of the at least one characteristic uses the determined characteristic modifications.

A non-transitory computer readable medium having a computer program, which is executable by a processor, comprising:

• a program code arrangement having program code for protecting a network having multiple network subscribers against a cyberattack, by performing the following:
• analyzing bits or bit sequences of a message;
• determining, based on the analysis, characteristic modifications for transmitting the bits or bit sequences of the message;
• and
• after the determining, transmitting the bits or bit sequences of the message between the network subscribers in the network via different voltage levels on at least one transmission route of the network;
• wherein at least one characteristic of the voltage levels or of the transmitted bits or bit sequences is actively modified in at least one of the network subscribers or on the at least one transmission route, the origin of the transmitted bit or of the transmitted bit sequence is determined by the at least one network subscriber or the at least one transmission route based on the at least one characteristic, and the cyberattack is detected or the cyberattack on the network is localized in the network as a function of the ascertained origin;
• and
• wherein the active modification of the at least one characteristic uses the determined characteristic modifications.