Researchers at the University of California, Santa Barbara, have developed a novel method for imaging objects beyond the line of sight, which they've named "Wiffract." This technique...
You just need to write it smaller than the Wi-Fi wavelength (about 60 nm) and you should be fine. If someone wants to read it, they have to use smaller wavelengths (i.e. higher frequencies), which means there’s a good chance that they will be blocked by your walls.
Edit: c/2.4 GHz ≈ 125 mm
I took the first value from Wikipedia, without thinking about it enough.
And here I am thinking that hanging my passwords on the wall as art was hack proof. I guess it’s time to redecorate.
You just need to write it smaller than the Wi-Fi wavelength (
about 60 nm) and you should be fine. If someone wants to read it, they have to use smaller wavelengths (i.e. higher frequencies), which means there’s a good chance that they will be blocked by your walls.Edit: c/2.4 GHz ≈ 125 mm I took the first value from Wikipedia, without thinking about it enough.
I think your fag packet calculation has got a power of ten wrong somewhere. Wi-fi is GHz so that would be on the order of centimetres I think.
Yes. Wifi is 2.4 GHz, speed of light is 0.3 Gm/s. Therefore one wavelength is 0.3/2.4 m/s/Hz = 12.5 cm
Or 0.001 football pitches
Yeah, you’re right. Writing it smaller than 12.5 cm should do it, which is entirely reasonable.
What if I use an awesome font like Comic Sans and round the faces like party balloons? Still visible?