Looks like I got a chance to stimulate insights tonight. So let's talk about RFID.

An RFID is a "passive" radio circuit, in the sense that it does not need a battery. It merely receives a stimulus, "mates" with an antenna, and responds with a rather long number.

There are all shapes: button, leaflet, label, sticker (similar to that of the stickers). They are used in production chains, to allow robots to "feel" the pieces.

They are also those that are used in supermarkets at the checkout: once the purchase is registered, the scanner at the exit does not ring if you go through it. If an RFID that is not in the database passes, then the shoplifting alarm sounds.

The fact is that RFID also works after purchase. It means that they continue to "ring out" if required. There is one in the passport, they are the ones you put in the animals when you "chippate" them.

The trouble is that they are almost never removed. There are some in the bags, in the jackets, in the tomes of the tennis shoes, in the labels of the pants. They often resemble a strange additional button sewn to the jacket.

When you turn, bring three to five of them with you. An RFID detector does not have the shape of a camera and is not covered by any law that obliges you to notify of surveillance. Being a detector that works in radio frequency, it can be hidden from view. Depending on the type, they range from a few cm to 16 meters.

In practice, it is possible to place them on the streets. If you have a big data infrastructure, you can track people. It will be noticed that every morning, on going to work, the group of RFID X {a, b, c, d} makes the journey that passes through the sensors 1,2,3,4,5.

Unlike cameras, RFID sensors are not visible. You don't know where they are because they don't have to be visible. They can be hidden in the door jambs, under the plaster, or they can also be visible: the average man does not know what all the boxes he sees on the street are.

But, since we all have some on them, they are the cheapest way to track people. In fact, an RFID sensor costs less than a camera, and consumes less bandwidth.

Those who believe that electronic surveillance is done with cameras and facial recognition are probably chasing a false target.

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