Siemens Mobility Gmbh

Markus Seemann

Stefan Gerken

Andreas Schallenberg

A method transmits a message from a transmitter to a receiver. A telegram generated by the transmitter and contains the message and check data, is transferred to a transmitter-side access protection device. The transmitter-side access protection device modifies the telegram and then transmits it to a receiver-side access protection device. The transmitter-side access protection device modifies the telegram by encrypting the check data, which contains a security code formed with the message by the transmitter, using a secret key forming coded data. The message remains unencrypted in the telegram. The receiver-side access protection device processes the modified telegram and passes the processed telegram to the receiver. The receiver-side access protection device forms the processed telegram by decrypting the coded data, and the receiver verifies the processed telegram using the message contained therein and the check data contained therein and rejects the message if the check data does not correlate.

Method and arrangement for the secure transmission of a message from a transmitter to a receiver

In a method for computer-assisted operation of a memory unit, data is saved in the memory unit and the data is encoded before saving, or data is retrieved from the memory unit and the data is decoded after retrieval. For first-time encoding of the data, at least one group of application data sets, containing data segments having identical application data for an application program and check data segments having different diversity characteristic data respectively, is generated or selected from a supply of possible diversity characteristic data. Each application data set is encoded and saved. The data is retrieved in that the application data sets are retrieved and decoded. Data is saved in that the application data sets are encoded and saved. Furthermore, a method for computer-assisted, repeated execution of an application program in redundant computing instances, a computer program product and a provision apparatus are disclosed.

Method for computer-assisted operation of a memory unit and execution of application programs having redundant data storage

In a method for computer-assisted operation of a memory unit, encoded data is saved in the memory unit. The data is retrieved and decoded after retrieval. The memory unit is monitored for errors in that a temporal sequence of computer-assisted checking operations is carried out for the memory unit. For first-time encoding of the data, each required application data set is generated or selected, containing check data segments. For each application data set, the check data segment is occupied by count data, which characterizes the checking operation being implemented. After retrieving and decoding the application data sets, an error is determined when the count data characterizes neither the checking operation being implemented nor the most recent completely implemented checking operation. The check data segment of the relevant application data set is occupied by count data, which characterizes the checking operation being implemented, if no error was determined.

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Braunschweig, Germany

Markus Seemann