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Howdy – Windows Hello style facial authentication for Linux

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Re: Howdy – Windows Hello style facial authentication for Linux

#41

Post by Pwntastic »

simtel20 wrote: post #40
Pwntastic wrote: post #25

Earlier quoted context omitted.

It was relatively easy to setup a yubikey bio fingerprint device in arch with pam-u2f. I just kinda followed the wiki here: https://wiki.archlinux.org/title/Universal_2nd_Factor It wasn't strictly plug and play, but it only took like 20 minutes of fiddling.

I thought yubikeys only provided a sensor for the fact that the sensor was touched, vs fingerprint resets that actually distinguish whose fingerprint is touching the sensor before being usable as an authenticator

most of them only have touch sensors but the yubikey bio series devices have actual fingerprint readers, and as part of the device setup you register one or more fingerprints which are then stored on the device itself

Re: Howdy – Windows Hello style facial authentication for Linux

#42

Post by MengerSponge »

westurner wrote: post #39
MengerSponge wrote: post #36

Earlier quoted context omitted.

I don't know how Google does it, but it's possible to extract 3d information from a 2d sensor. You either need a variable focus or phase detection in the sensor.

It is possible to infer phase from second order intensity via the Huygens-Steiner theorem for rigid body rotation, FWIU: https://news.ycombinator.com/item?id=42663342 .. https://news.ycombinator.com/item?id=37226121#37226160 Doesn't that mean that any camera can be used to infer phase (and thus depth for face ID, which is a high risk application)? > variable focus A light field camera (with "infinite" focus) would al…

Very cool. Yes, probably? I'll have to think about the relationship between image quality and the fidelity of the derived phase measurement, because it's not obvious how good a camera needs to be to be "good enough" for a secure system.

Light field? I remember Lytro! Such cool technology that never found its niche. https://en.wikipedia.org/wiki/Lytro

Is anybody making a successor product?

Re: Howdy – Windows Hello style facial authentication for Linux

#43

Post by westurner »

MengerSponge wrote: post #42
westurner wrote: post #39

Earlier quoted context omitted.

It is possible to infer phase from second order intensity via the Huygens-Steiner theorem for rigid body rotation, FWIU: https://news.ycombinator.com/item?id=42663342 .. https://news.ycombinator.com/item?id=37226121#37226160 Doesn't that mean that any camera can be used to infer phase (and thus depth for face ID, which is a high risk application)? > variable focus A light field camera (with "infinite" focus) would al…

Very cool. Yes, probably? I'll have to think about the relationship between image quality and the fidelity of the derived phase measurement, because it's not obvious how good a camera needs to be to be "good enough" for a secure system. Light field? I remember Lytro! Such cool technology that never found its niche. https://en.wikipedia.org/wiki/Lytro Is anybody making a successor product?

I guess the task is to design an experiment to test the error between phase inferred from intensity in a digital camera by Huygens-Steiner and a barycentric coordinate map And far more expensive photonic phase sensors.

Is (framerate-1 Hz) a limit, due to the discrete derivative being null for the first n points?

Fortunately this article explained the implications of said breakthrough; "Physicists use a 350-year-old theorem [Huygens-Steiner] to reveal new properties of light waves" https://phys.org/news/2023-08-physicists-year-old-theorem-re... :

> This means that hard-to-measure optical properties such as amplitudes, phases and correlations—perhaps even these of quantum wave systems—can be deduced from something a lot easier to measure: light intensity.

IDK what happened with wave field cameras like the Lytro. They're possibly useful for face ID, too?

"SAR wavefield". There's a thing.

From https://news.ycombinator.com/item?id=32819838 :

> Wave Field recordings are probably [would probably be] the most complete known descriptions of the brain and its nonlinear fields?

Re: Howdy – Windows Hello style facial authentication for Linux

#44

Post by KetoManx64 »

throwaway889900 wrote: post #35
zettabomb wrote: post #34

Earlier quoted context omitted.

Incorrect. Windows Hello uses special hardware.

Right, Windows Hello requires it for facial auth, Windows itself does not. Hello still works, just you have to authenticate with a different method if the hardware isn't present.

How little is your time worth that you spend it making pedantic little correctioms like this?

Re: Howdy – Windows Hello style facial authentication for Linux

#45

Post by AStonesThrow »

KetoManx64 wrote: post #44
throwaway889900 wrote: post #35

Earlier quoted context omitted.

Right, Windows Hello requires it for facial auth, Windows itself does not. Hello still works, just you have to authenticate with a different method if the hardware isn't present.

How little is your time worth that you spend it making pedantic little correctioms like this?

[dead]

Re: Howdy – Windows Hello style facial authentication for Linux

#46

Post by swores »

written-beyond wrote: post #7
charcircuit wrote: post #5

This isn't "Windows Hello style." This program extracts features from a 2d image instead of doing depth reconstruction first. This makes it easy to fool with a piece of paper. Also this only handles user authentication unlike on Windows where it can be usedpasskey. disk encryption and for passkeys. Edit: This program also saves the landmarks of your face into a file in plain text when it gets added.

Really? When I tried on an hp spectre 5 years ago it made the hell sensors make a horrible clicking sounds and the LEDs glow red. I assumed it was doing something with depth analysis.

The comment you replied to is saying that this new Linux equivalent is only doing 2D, not that the Windows version (which you had on your HP) is only 2D :)

Re: Howdy – Windows Hello style facial authentication for Linux

#47

Post by throwaway889900 »

KetoManx64 wrote: post #44
throwaway889900 wrote: post #35

Earlier quoted context omitted.

Right, Windows Hello requires it for facial auth, Windows itself does not. Hello still works, just you have to authenticate with a different method if the hardware isn't present.

How little is your time worth that you spend it making pedantic little correctioms like this?

Bored at work lol
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