This paper is an introduction to the specific use of the cryptographic iButton as the electronic key used as a safety apparatus developed by the American company Dallas with illustration of its hardwares structure and design principles.

• 介绍了美国 DALLAS公司生产的自动识别产品 i Button作为电子钥匙在汽车防盗器中的具体应用 ,并给出了它的硬件结构、设计原理