<s>
BusKill	B-Operating_System
is	O
an	O
open-source	B-Application
hardware	O
and	O
software	B-Application
project	O
that	O
designs	O
computer	O
kill	O
cords	O
to	O
protect	O
the	O
confidentiality	O
of	O
the	O
system	O
's	O
data	O
from	O
physical	O
theft	O
.	O
</s>
<s>
The	O
hardware	O
designs	O
are	O
licensed	O
CC	O
BY-SA	O
and	O
the	O
software	B-Application
is	O
licensed	O
GPLv3	B-License
.	O
</s>
<s>
BusKill	B-Operating_System
cables	O
are	O
available	O
commercially	O
from	O
the	O
official	O
website	O
or	O
through	O
authorized	O
distributors	O
.	O
</s>
<s>
The	O
name	O
BusKill	B-Operating_System
is	O
an	O
amalgamation	O
of	O
"	O
Bus	O
"	O
from	O
USB	B-Protocol
and	O
"	O
Kill	O
"	O
from	O
kill	O
cord	O
.	O
</s>
<s>
The	O
term	O
"	O
BusKill	B-Operating_System
"	O
was	O
coined	O
by	O
Altfield	O
in	O
January	O
2020	O
when	O
publishing	O
the	O
first	O
BusKill	B-Operating_System
build	O
and	O
udev	B-Application
usage	O
instructions	O
(	O
Linux-only	O
)	O
,	O
and	O
it	O
was	O
ported	O
by	O
cyberkryption	O
from	O
Linux	B-Application
to	O
Windows	O
a	O
couple	O
weeks	O
later	O
.	O
</s>
<s>
The	O
first	O
OS	B-Operating_System
X	I-Operating_System
version	O
of	O
the	O
BusKill	B-Operating_System
app	O
was	O
released	O
in	O
May	O
2020	O
by	O
Steven	O
Johnson	O
.	O
</s>
<s>
A	O
cross-platform	O
rewrite	O
of	O
the	O
software	B-Application
based	O
on	O
Kivy	B-Language
was	O
released	O
in	O
August	O
2020	O
with	O
support	O
for	O
Linux	B-Application
,	O
OS	B-Operating_System
X	I-Operating_System
,	O
and	O
Windows	O
.	O
</s>
<s>
In	O
December	O
2021	O
,	O
Alt	O
Shift	O
International	O
OÜ	O
ran	O
a	O
crowdfunding	O
campaign	O
to	O
manufacture	O
BusKill	B-Operating_System
cables	O
on	O
Crowd	O
Supply	O
.	O
</s>
<s>
The	O
BusKill	B-Operating_System
cable	O
is	O
a	O
kill	O
cord	O
that	O
physically	O
tethers	O
a	O
user	O
to	O
their	O
computer	O
with	O
a	O
USB	B-Protocol
cable	O
.	O
</s>
<s>
A	O
3D-printable	O
hardware	O
BusKill	B-Operating_System
cable	O
is	O
currently	O
under	O
development	O
.	O
</s>
<s>
The	O
BusKill	B-Operating_System
project	O
maintains	O
a	O
cross-platform	O
GUI	O
app	O
that	O
locks	O
the	O
screen	O
when	O
the	O
cable	O
's	O
connection	O
to	O
the	O
computer	O
is	O
severed	O
and	O
the	O
app	O
is	O
in	O
the	O
"	O
armed	O
"	O
state	O
.	O
</s>
<s>
If	O
the	O
computer	O
is	O
separated	O
from	O
the	O
user	O
,	O
then	O
a	O
magnetic	O
breakaway	O
in	O
the	O
cable	O
causes	O
a	O
USB	B-Language
hotplug	I-Language
removal	I-Language
event	O
to	O
execute	O
a	O
trigger	O
in	O
the	O
app	O
.	O
</s>
<s>
The	O
trigger	O
executed	O
by	O
the	O
BusKill	B-Operating_System
cable	O
's	O
removal	O
can	O
lock	O
the	O
screen	O
,	O
shutdown	O
,	O
or	O
securely	O
erase	O
the	O
LUKS	O
header	O
and	O
master	O
encryption	O
keys	O
within	O
a	O
few	O
seconds	O
of	O
the	O
cable	O
's	O
separation	O
.	O
</s>
