i am sitting down with the designers of
the tour badge which i touched on my
other video but this one specifically is
absolutely bonkers because unlike just a
blinky led badge
it is a lie detector in a badge and we
want to go into some of the details i'm
hooked up to it right now
and we'll get to try it out but first
let's just talk about the badge in
general i have the creator sitting here
we're going to keep them off camera
though so can you give me like a one or
two sentence description of like what
does this thing do
sure so this is a mini lie detector or
polygraph so it has two primary sensors
it has a heart rate sensor that shines a
green led into your finger and then
measures the blood flow and it also has
a galvanic skin response sensor or gsr
which measures measures the resistance
difference between those two finger
cuffs on your finger
so as you get nervous or an adrenaline
dump or embarrassed you sweat a little
bit and the resistance between those two
contacts on your fingers will change
it's vegas so i'm pretty much sweating
all the time i'm a big dude
so i'm hooked up to this thing right now
so you have a lot of sensors we also
have the person who designed all the
hardware for this badge now question for
you
is
when you were designing this badge like
it has been a nuts year for badge design
did you get hit with any of the chip
shortage problems oh yeah yeah we had a
lot of trouble with the chips uh
specifically the potentiometer you know
it's such a standard simple part but we
had a lot of trouble getting these uh we
actually had to buy really long ones cut
them down because we couldn't even get
the right part and we had to do a few
more substitutions for the chips we had
to use like automotive grade parts where
normally you wouldn't need automotive
grade parts they're a little bit more
but they were available and that's what
we had to use
um as far as i know we bought almost all
of these microcontrollers that that they
had because as soon as we as soon as our
order was filled they were sold out
so yeah it was it was it was nuts with
the chip shortages so what gave you the
idea for this like again between there's
two other things i want to talk about
but like what gave you the idea to do
like this is a crazy design i've never
seen a lie detector in a badge and it
totally feels a little weird being
hooked up to it right now
so i made a badge in defcon 23
originally for the defcon shoot it was a
shot counter and clapper and some other
things then two years ago i made these
little shitty add-on
badges for tor and that was also a
fundraiser
and i've always kind of wanted to do
another badge seed studio has this suite
of sensors called grove sensors and one
of them is a gsr one of them is a heart
rate so i could kind of breadboard this
out really easily see that it works
test the oleds make sure the
the refresh rate on the oleds is fast
enough
and uh yeah i mean it's just a kind of
fun little
badge that actually does something and
it's kind of fun to play with now you
something you said is like this this is
like there's
obviously there's a little bit of profit
when you sell these where does that
profit go do you keep that just to make
create your new badge or is that going
to support something yeah so all profits
from this batch sale and the batch sale
two years ago go to the tour project i
fund all development personally and if
the badges come back and they don't work
i am just screwed and i lose all my
money
no one funds me initially i just hope
that i sell that they work and i sell
enough to recoup my hardware costs i
don't charge for my time or effort or
anything else i mean what's really cool
about that too is the fact that like
they sold out like of course they're
gonna sell out it's a lie detector
in a badge like
what's not to love about that it's not
like those crappy lie detectors like
you'd get like in your 101 electronics
kit which never worked like this thing
is actually kind of solid like it's
still a small one and you got like
sitting on it and there might be some
defensive measures so now let's try it
right now so i'm hooked up to the thing
right now can you go ahead and we'll get
this thing started
so on the right screen is the heart rate
sensor now right now you're just picking
up like ambient light changes
the left screen is the galvanic skin
response sensor so it's going to measure
the difference in the finger cuffs that
you have on your finger and as you move
around or change the pressure on there
that's why it's kind of jumping around
so if if you remain still and take a
sharp inhale exhale breath and kind of
force yourself to sweat a little bit or
get nervous
in and out quickly
yeah it's dropping it's dropping
so it picks up that like inner
embarrassed feeling or that flush
feeling and that causes a little bit of
sweat and that sweat causes a difference
in resistance between those contacts so
okay so one of the ways i've always seen
lie detectors use is that you calibrate
it with like a few questions so like ask
me like a couple easy questions like
is my shirt red or something like that
well that's the thing they don't use the
easy questions they use the hard
questions that's why they get you they
ask you something like have you ever
stolen anything and then you confess to
maybe stealing a few little things and
then they say other than what you've
told me have you ever stolen anything
and then that that's called a probable
lie question okay so you you
almost certainly are lying because you
can't possibly remember everything that
you've ever stolen
so so have you ever stolen anything
absolutely not never before oh you look
like oh
it's dropping it's already dropping
that's a massive lie
okay okay you know what i'm gonna
comment on this i may have used napster
at one time in the past to steal like
once that's not even stealing
that's what it was no
all right so that that's so cool it did
massively drop when you said that that
that's that's absolutely insane so with
them sold out
there might be another production run
there might not be another production
run where should they be looking to see
if they can pick one up yeah so i'm
personally bad at uh optimizing
fundraisers i mean if i was good at this
i would just make a massive run and sell
a bunch online it's more like a hobby
fundraiser so that's why we make these
at defcon and then
usually try to sell out which we have
both two years ago and this year i'm
gonna contact tor and see if they're
interested in making another run if we
are
you can follow the tour project on
twitter and i'm sure they'll post about
it if that happens
guys thank you so much for sitting down
with me thank you for catching me in a
lie i didn't
feel a little bad about that one
thank you for creating such a cool badge
and bringing it to defcon and you guys
thanks for watching and hack on