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> Notably, Li-fi ensures robust security by exclusively transmitting data to areas illuminated by light. Can someone explain how this ensures security? Becaus
by FergusArgyll 3y ago
> Notably, Li-fi ensures robust security by exclusively transmitting data to areas illuminated by light.
Can someone explain how this ensures security?
Because hackers always work in the dark? /s
- transpute 3y ago> security Wi-Fi passes through walls, can be used to remotely infer keystrokes, human biometrics, position and activity. > dark Li-Fi can use infrared light, does not pass through walls.
- ReactiveJelly 3y agoIt might enable security but I wouldn't say it _ensures_ it. It just means that visible or IR light (What are they using?) won't leak through walls the way Wi-Fi does. Depending on how wide the beam is and exactly how it all works, it _might_ still leak out of windows and under doors. But it's not like someone casually wardriving outside your house will get as much as they would from Wi-Fi, I would think.
- smallnix 3y agoHow can visible light pass from a core of a star or planet to the outside, but some routers light not? I guess it's just super duper faint?
- colechristensen 3y agoVisible light does not pass from the core of a star to the outside. The sun has a radius of about 700,000 km. Only a few hundred km is transparent enough for light to pass through and has a density of about 300 mg per cubic meter. Roughly the density of air at the altitude where airliners cruise. The photons you see originate from a layer that’s just 0.5% of the radius of the sun. That layer is heated with other photons from inside. The core temp is 15 million K while the photosphere is around 5800 K. The spectrum of the core were the rest of the sun transparent would be much different and … unsafe. (Not that this really makes sense, if the rest of the star was transparent it would go nova)
- Modified3019 3y agoUsing light to heat up the walls of a home enough to start emitting significant black body radiation poses some additional engineering challenges.
- wiml 3y agoThe house's thermal mass would also limit the data rate.
- deleted 3y ago[deleted]
- tsimionescu 3y agoI think that yes, compared to the core of a star, a LiFi AP is aptly described as "super duper faint".
- Turing_Machine 3y agoYeah, you'd want blackout curtains (or better, paint) on your windows. Still cheaper and easier than making your office into a Faraday cage.
- bb88 3y agoThat assumes that Li-Fi doesn't leak RF still.
- jfoutz 3y agoWorking graveyard and renting, I learned aluminum foil is perfect. cheap, trivial to install and remove. and perfectly opaque.
- osigurdson 3y agoCan encryption not be used with LiFi?
- Turing_Machine 3y agoPoor wording. I think what they're getting at is that, unlike wifi, light doesn't pass through walls, floors, ceilings, etc. Anything that isn't directly illuminated by the light beam will have effectively no signal, making it less likely to be picked up from (say) five offices away.
- Dylan16807 3y agoThough if there's a window around that light might go further than 60GHz, which is presumably the best competitor for same-room high-bandwidth links.