Abstract: A digital tachograph has a security module. A public key, a secure private key, and a signage are stored in the security module. Vehicle-relevant data and the corresponding checksum are encoded using a secure private key and stored in the digital tachograph in a data format by the security module.

Abstract: A digital tachograph has a security module. A public key, a secure private key, and a signage are stored in the security module. Vehicle-relevant data and the corresponding checksum are encoded using a secure private key and stored in the digital tachograph in a data format by the security module.

Abstract: A single-chip computer includes at least one first processor core and at least one second processor core constructed on a common chip. The at least one first and the at least one second processor cores are interconnected via a processor interface. Data can be read via a separate or common memory interface from a separate or common data memory respectively and/or stored in said data memory. The single-chip computer includes an encryption and decryption unit which is assigned to the at least one processor core and which is constructed and functionally arranged between the at least one second processor core and the memory interface in such a way that the data which can be exchanged between the at least one second processor core and the data memory can be encrypted and decrypted by the encryption and decryption unit.

Abstract: Method for preventing a high voltage circuit form generating excessive high voltage, wherein the method comprises the following steps: a) reading a digital representation of a reference value associated with one of a plurality of operation modes stored in a memory; b) verifying the integrity of the representation of the reference value; c) providing a sensed signal representing the output voltage of the high voltage circuit; d) comparing the sensed signal with the reference value; e) inhibiting the generation of the high voltage output if the comparison in step (d) indicates excessive high voltage.

Abstract: Method for preventing a high voltage circuit form generating excessive high voltage, wherein the method comprises the following steps: