Method for generating a secret or a key in a network

Abstract

Disclosed is a method for generating a secret or a key in a network (20). The network (20) comprises at least a first subscriber (21) and a second subscriber (22) and a common transmission channel (30) between at least the first (21) and second subscribers (22). The first subscriber (21) can output at least a first value (1) and a second value (0) and the second subscriber (22) can output at leastthe first value (1) and the second value (0) on the transmission channel, the first subscriber (21) generating a first sequence of subscriber values and the second subscriber (22) generating a secondsequence of subscriber values in order for the transmission to occur largely synchronously on the transmission channel (30); and the first subscriber (21) and the second subscriber (22) each generatea common secret or a common key, the first subscriber (21) doing so on the basis of information about the first sequence of subscriber values and on the basis of a sequence of superposed values resulting from a superposition of the second sequence of subscriber values onto the first sequence of subscriber values on the transmission channel (30), and the second subscriber (22) doing so on the basis of information about the second sequence of subscriber values and on the basis of the sequence of superposed values resulting from the superposition of the second sequence of subscriber values ontothe first sequence of subscriber values on the transmission channel (30). At least the first subscriber (21) and the second subscriber (22) determine a sequence of test values in accordance with the resulting sequence of superposed values and output same on the transmission channel (30).

Description

technical field [0001] The invention relates to a method for generating a secret encryption key in a network, in particular a common secret key between two participants of the network. Point-to-point (Punkt-zu-Punkt) connections generally also belong to networks and are therefore also addressed here using the term. In this case, the two participants communicate via a jointly used transmission medium. In this case, a logical bit sequence (or generally a value sequence) is physically transmitted via a corresponding transmission method as a signal or signal sequence. The underlying communication system can be, for example, a CAN bus. The CAN bus provides for the transmission of dominant and recessive bits or corresponding dominant and recessive signals, wherein the dominant signals or bits of the network participants are implemented relative to the recessive signals or bits. The state corresponding to the recessive signal is set on the transmission medium only when all partici...

AI Technical Summary

Problems solved by technology

However, especially in wired or optical systems, this approach is often only suitable conditionally, since the corresponding channels usually have only very limited temporal variability, and an attacker can, for example, use model formation relatively well Draw conclusions about channel parameters between sender and receiver

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