see url: https://www.inverse.com/innovation/human-hand-encryption-study
see full article...Interesting way of using parts of the human body for
the purposes of encryption...
Quote<<<
Whether written invisibly with lemon juice or encrypted with complex
math, secret messages are passed on through a myriad of bizarre and
convoluted ways.
A team of engineers from China is introducing a new way to secretly
transmit our most secret data or access secure locations using a tool
that can be found on your person at any time: the human hand.
In their paper published Monday in the journal Proceedings of the
National Academy of Sciences, the team demonstrated how infrared
radiation (i.e. heat) coming from the hand can be used to not only
decrypt secret messages but also to create passcodes that cannot be
cloned or reproduced, granting unique access to information or locations
with just a wave.
The integration would offer a power-free, multi-functional decryption
system with intelligent human-machine integration — in other words, a
powerful way to secure data that is controlled by the human body instead
of a computer.
Here’s the background — If your hand is meant to be a beacon of light
illuminating hidden mysteries, then why doesn’t it seem to glow when you
look at it? It’s because the part of the electromagnetic spectrum that
our hands (and whole bodies) “glow” in is outside of the visible range,
meaning our eyes simply aren’t equipped to see it.
This electromagnetic range spans everything from large, low-frequency
radio waves (like those sending tunes to your favorite FM station) to
incredibly small and high-frequency gamma rays (like those inside atomic
nuclei or the depths of space.)
Visible light — which captures all the colors that we see — ranges from
750 nanometers in wavelength to 380 nanometers and infrared light falls
just outside this range with wavelengths between 1 millimeter to just
above 750 nanometers.
But just because we can’t see the light that we emit, doesn’t mean it’s
not there. Just as your hand looks unique to the human eye, its IR
signature is unique as well. And because we effortlessly generate this
light just by keeping our bodies at homeostasis, the authors write that
it was the perfect candidate for a power-free decryption tool.
What they did — To transform the unremarkable human hand into a powerful
decryption tool, the team only had to separate ambient infrared
radiation (e.g. heat in a room) from the infrared radiation coming
specifically from a hand. A kitchen scale is a good way to think about
how this was done.
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