bcla
On our rugged Eastern foothills.....
- Joined
- Nov 28, 2012
I think that's how our Highlander works as well. Much like a Magic Band I'm guessing.
There are a bunch of ways to do it. Having the battery powered transmitter that communicates with the car's security system is what most people are thinking of with this topic.
Not quite sure what yours is using. There have been "dumb" contactless key card systems for at least 30 years. I used those to get into the computer room at college and later at work to get in after hours. Those just contained a code that never changed. More modern stuff uses a "contactless smart card" where even something that could snoop on the transmission couldn't be used to copy it. There's an algorithm in stuff like credit cards or even smart phones, and the reader expects an exact response. For something like a credit card or a fare card, it simply needs to provide a small amount of RF energy that's converted to power the system. The more advanced ones have electronics that can provide a more or less unique response.