Technical Sensor Question

Using Arduino Networking, Protocols, and Devices
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I am wondering about what kind of sensor can be used for directed encryption sharing with a sensor.

So NFC works by being within a short range and is encrypted.

I was wondering if there is some kind of sensor setup I could create where you have information that needs to be encrypted from device A, that device aims a sensor at the device B,(kind of like infrared, a TV remote), B acknowledges recognition with a blink pattern or something, then the package is sent with a click by A. ( Infrared doesn't have secure layer)(I know your all thinking just use bluetooth or email or something) But the whole idea is to keep it outside of the net for other reasons. Wondering what types of technologies would allow me to do so OTA. As for the programming necessary, I am sure I can come up with it, I just need to know what type hardware mix can make this happen.

I hope this makes sense. TYIA

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In principle, you can encode data transmitted by IR using any encryption technique you like.

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Just have some crypto capable MCU attached to the sensor so that the reading is local. Then the MCU is the one broadcasting the data in an encrypted way to whoever wants it

You have many choices (LoRa, RF24, BLE, BT, WiFI, HC12, Zigbee, …) for the radio and it can be just a local link over WiFi no need for Internet…. (could also be IR, LiFi,…)

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Years ago we used to "encrypt" data by swapping the nibbles in each byte!

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Xbee radios work for your needs?

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