Never be concerned whether or not your household electronics are spying on you! This new repurposing of the “ON AIR” sign will save you from fretting!



It seems that nearly every electronic device with a camera or microphone is now Internet-enabled and can wirelessly send video and audio to the world.

The issue:

Due to the preponderance of electronic hardware in a modern household, it can be difficult which (if any) device is spying on you at that exact moment (Figure 1).

This is a relatively new phenomenon, since it used to be the case that:

  1. Cameras were relatively large
  2. Non-CIA recording devices generally needed to be physically wired to a power source and network cable.

Fig. 1: One of these devices is currently streaming video from the user’s house—but which one? Video-enabled devices sometimes have a recording light (but not always: e.g. phones, tablets), but checking these lights is still annoying and time-consuming. And audio recording generally has no indication whatsoever!


The classic solution to the “are we recording right now?” question is a lit-up “ON AIR” sign [see examples] that can light up whenever a TV station is broadcasting.

This same concept can be applied to modern devices: a person would buy a new piece of “ON AIR” hardware (this would essentially just be a WiFi-enabled screen). This ON AIR sign would connect to the household WiFi network light up any time it detected video being sent out to the Internet.

Detecting that streaming is happening could occur in two ways:

1) Network traffic analysis can generally identify data as “this is a stream of video / audio.” This is a solution that would probably work in most cases.

2) Each video/audio-enabled device can talk to the ON AIR sign over WiFi and notify it that streaming is occurring. This would be on the “honor system”: well-behaved software would periodically report that it was streaming. One benefit of this opt-in method is that streaming devices could send additional metadata: e.g., instead of just “ON AIR (Some computer is sending video),” the user would see “ON AIR (Joe’s PowerBook G4, streaming video over RealPlayer for 4:34)”.

Fig. 2: Thanks to this lit-up “ON AIR” sign, the user knows that there is some device recording them, and exactly which device is responsible (in this case, the “smart television”).

Of course, neither of these methods is a 100% guarantee of detecting live video being streamed: for example, a phone that was using its cellular data to stream would not be detected.


This could probably be a legitimate product!

PROS: Would be a good value-add option for a router manufacturer. “This router will light up if it detects outgoing video/audio!”

CONS: Might cause the user to become extremely paranoid upon realizing that their watch, tablet, computer, phone, external monitor, fitness tracker, headphones, and dozens of other devices could all be surreptitiously spying at any time.