| 摘要 |
A portable transponder, such as key, first sends invalid data to a lock, whereupon a challenge signal with a memory address is transmitted back to the transponder. A code word stored in memory at the memory address in the transponder is read out and transmitted to the lock. There, the code word is compared with a desired code word. If they correspond, an immobilizer is released. Next, the address and/or code word is recalculated in the lock and adjusted in the transponder for the next release cycle. An alternating code is thus created. |
