US 11,683,323 B2
Method and device for authenticating a message transmitted via a bus
Marcel Kneib, Mainhardt (DE); Christopher Huth, Leonberg (DE); and Jo Pletinckx, Sersheim (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on May 21, 2019, as Appl. No. 16/418,489.
Claims priority of application No. 102018208118.2 (DE), filed on May 23, 2018.
Prior Publication US 2019/0364054 A1, Nov. 28, 2019
Int. Cl. H04L 9/40 (2022.01)
CPC H04L 63/123 (2013.01) [H04L 63/08 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of a sampling and authenticating device including an analog-digital converter (ADC) and a processor communicatively coupled to the ADC for sampling electrical signals of a message from a communication channel on which the electrical signals are transmitted and for authenticating the message, the method comprising:
sampling, by the ADC, recurring electrical signal edges within a data frame of the message, thereby obtaining respective sampling values, wherein the sampling is performed such that for each pair of immediately adjacent ones of the sampled electrical signal edges, a respective start time of the sampling of the respective electrical signal edge, relative to a start of the respective electrical signal edge, is offset between the electrical signal edges of the respective pair;
the processor reconstructing an average signal characteristic of a part of the message from the sampling values sampled by the ADC;
the processor determining signal-technical properties of the data frame from the average signal characteristic; and
the processor authenticating the message based on the signal-technical properties.