Raspberry Pi

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Raspberry Pi is a series of small single-board computers. It is widely used in many areas because of its low cost, modularity, and open design. It is typically used by computer and electronic hobbyists.

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Secure use of remote control ? (programming.dev)

submitted 2 weeks ago by Rick_C137@programming.dev to c/raspberry_pi@programming.dev

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Hi Raspberry Pi Community,

I would like to use radio remote's control to trigger an events on my Raspberry pi.

I guess I'll go with 433Mhz as I believe they are the most common available ?

So I will need a 433Mhz RX/TX Module to connect on the GPIO, so far I get it...

But how properly secure the communication between those remotes and the RPI to avoid any anyone to sniff the transmitting and replay it. In other words spoof it.

Wubba Lubba dub-dub...

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[–] Zachariah@lemmy.world 1 points 1 week ago (6 children)

Could it only accept serialized messages? Once it’s received a message, never accept the same exact message again.

[–] tapdattl@lemmy.world 1 points 1 week ago (4 children)

Well then you'd have to keep track of all messages recieved. An easier option might just be to sign the current system time, make sure the clocks are synchronized, and accept a +/- 1 second wiggle

[–] Zachariah@lemmy.world 2 points 1 week ago (3 children)

Wouldn’t it just need to know which is the highest message number it has seen? And then don’t accept that one or any lower ever again?

If the count is within the encrypted message, no one can spoof anything higher.

[–] tapdattl@lemmy.world 2 points 1 week ago

Oh fair good point

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