Nanochips embedded devices in the body for the future

I ever saw body modifications done in the world,like those who inserts ball-bearings to the surface of their skin as a form of body art,like tattoo.

Technology will become more advance in the future,with the introduction of nano technology in fabrication of wafer and eventually lead to the creation of smaller nanodevices.

Imagine a form of security devices embedded under the palm of your hand,that you can open car,door or access security enabled hardware in the future.