| 摘要 |
The invention relates to the field of sensor units 10 capable of sending measurements along with a digital signature. The sensor unit 10 sends some measurements along with a signature and sends some measurements without a signature, resulting in saving in the bandwidth on the transmission lines. Also the hash value used to compute the signature is computed as and when the measurements are taken, without storing the measurements in the memory. This provides efficient method of ensuring data integrity. The electronic control unit 14 which receives measurements from the sensor unit 10, needs to calculate signature only for a pre-defined number of measurements, from a total number of measurements. This saves the processing power of ECU 14 and still ensures the overall security for the measurements sent by the sensor unit 10. Triggers sent by the sensor unit 10 notifying start of the calculation of the signature, start of the transmission of the signature and end of the transmission of the signature will provide synchronisation of the sensor unit 10 with the ECU 14, to receive the information correctly. The triggers will also provide a configurability to vary the number of measurements which need to have the signature and to vary the number of measurements which need not have a signature. |
