| 摘要 |
In a vehicle security arrangement including a first part P1 for incorporation in a vehicle and a second part P2 for use as a key to allow operation of the vehicle, both the first part and the second part include signal processing means SP1, SP2 and signal receiving and sending means Rx1, Rx2, Tx1, Tx2, the signal processing means being responsive to an input signal of a first value to generate an output signal of a second value in accordance with a one-way hash function performed with a stored value SV on the first value, the stored value being computationally unfeasible to determine from the first and second values, the first part P1 including means to produce a first value signal V1 and in operation send this first value signal for the second part P2, in operation in the key position for the vehicle, to receive as a said input signal therefor and form a said second value output signal V2 therefrom, the first part P1 also including means Rx1 to receive said output signal of the second part P2 sent therefrom together with means CM to compare the received said output signal with a check value generated from the produced first value by the signal processing means SP1 of the first part and permit or prevent operation of the vehicle in accordance with the result of the comparison following the signal exchange. <IMAGE> |
