Robert Boschgmbh

Michael Boehl

Eberhard Boehl

Paulius Duplys

A device is described for forming a signature from an input signal (input). According to the present invention, a plurality of transformation elements is provided, each having a finite-state machine, to which, on the input end, in each case the input signal (input) and/or a signal (input'), that is a function of the input signal, is able to be fed, all the finite-state machines are similar and are configured in such a way, particularly able to be initialized, that each finite-state machine always respectively has a different state than do all the other finite-state machines, and the signature is formable as a function of state data of at least one finite-state machine.

Device and method for forming a signature

A method for the manipulation-proof transmission of data from a transmitter to a receiver, a test part being generated in the transmitter from the data using a secret key and communicated together with the data to the receiver, where a verification test part is generated from the received data using the same secret key and is compared to the received test part. Before the generation of the test part, the data are nonlinearly compressed using at least one feedback shift register. In addition, a device for the manipulation-proof transmission of data.

Method and device for manipulation-proof transmission of data

In a method for error handling in transmission of a datum over a communications system, at least two data words consisting of bits are generated for the datum in accordance with a predefined coding rule, and one of the generated data words is selected taking into consideration a running digital sum formed over the corresponding data word, and the running digital sum of the selected data word is used for the formation of a first running digital sum. The selected data word is converted into a code data word, and a bit of the data word is in each case assigned a two-bit string with two different single-bit values. The code data word and the first running digital sum are transmitted. The received code data word is examined to ascertain whether an erroneous two-bit string exists, in which case the error is corrected using the first running digital sum.

Method for error handling

A method and a device for generating codes in the transmission of data via a communications system having at least two subscribers, in which a first subscriber receives at least one data word and forwards the data word or an at least partially changed data word to at least one second subscriber, the data being represented as bits which are able to assume two different values, and at least two bits of a data word are coded in at least three bits in such a way that in the three coded bits always at least two bits of the same value follow each other and that, after the reception of one or two of the three coded bits, one may already be able to decide which first code bit is to be emitted.

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Stuttgart, Germany

Michael Boehl