<s>
AirDrop	B-Operating_System
is	O
a	O
proprietary	B-Application
wireless	B-Protocol
ad	I-Protocol
hoc	I-Protocol
service	I-Protocol
in	O
Apple	O
Inc.	O
'	O
s	O
iOS	B-Application
and	O
macOS	B-Application
operating	O
systems	O
,	O
introduced	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
(	O
Mac	B-Application
OS	I-Application
X	I-Application
10.7	I-Application
)	O
and	O
iOS	B-Operating_System
7	I-Operating_System
,	O
which	O
can	O
transfer	O
files	O
among	O
supported	O
Macintosh	B-Device
computers	O
and	O
iOS	B-Application
devices	O
by	O
means	O
of	O
close-range	O
wireless	O
communication	O
.	O
</s>
<s>
This	O
communication	O
takes	O
place	O
over	O
Apple	O
Wireless	O
Direct	O
Link	O
'	O
Action	O
Frames	O
 '	O
and	O
'	O
Data	O
Frames	O
 '	O
using	O
generated	O
link-local	O
IPv6	B-Protocol
addresses	I-Protocol
instead	O
of	O
the	O
Wi-Fi	O
chip	O
's	O
fixed	O
MAC	O
address	O
.	O
</s>
<s>
Prior	O
to	O
OS	B-Device
X	I-Device
Yosemite	I-Device
(	O
OS	B-Device
X	I-Device
10.10	I-Device
)	O
,	O
and	O
under	O
OS	B-Application
X	I-Application
Lion	I-Application
,	O
Mountain	O
Lion	B-Application
,	O
and	O
Mavericks	O
(	O
OS	B-Application
X	I-Application
10.7	I-Application
–	O
10.9	O
,	O
respectively	O
)	O
the	O
AirDrop	B-Operating_System
protocol	O
in	O
macOS	B-Application
was	O
different	O
from	O
the	O
AirDrop	B-Operating_System
protocol	O
of	O
iOS	B-Application
,	O
and	O
the	O
two	O
were	O
therefore	O
not	O
interoperable	O
.	O
</s>
<s>
OS	B-Device
X	I-Device
Yosemite	I-Device
and	O
later	O
support	O
the	O
iOS	B-Application
AirDrop	B-Operating_System
protocol	O
,	O
which	O
is	O
used	O
for	O
transfers	O
between	O
a	O
Mac	O
and	O
an	O
iOS	B-Application
device	O
as	O
well	O
as	O
between	O
two	O
2012	O
or	O
newer	O
Mac	O
computers	O
,	O
and	O
which	O
uses	O
both	O
Wi-Fi	O
and	O
Bluetooth	B-Protocol
.	O
</s>
<s>
Legacy	O
mode	O
for	O
the	O
old	O
AirDrop	B-Operating_System
protocol	O
(	O
which	O
only	O
uses	O
Wi-Fi	O
)	O
between	O
a	O
2012	O
or	O
older	O
Mac	O
computer	O
(	O
or	O
a	O
computer	O
running	O
OS	B-Application
X	I-Application
Lion	I-Application
through	O
OS	O
X	O
Mavericks	O
)	O
and	O
another	O
Mac	O
computer	O
was	O
also	O
available	O
until	O
macOS	B-Device
Mojave	I-Device
.	O
</s>
<s>
Apple	O
reveals	O
no	O
limit	O
on	O
the	O
size	O
of	O
the	O
file	O
which	O
AirDrop	B-Operating_System
can	O
transfer	O
.	O
</s>
<s>
On	O
iOS	B-Operating_System
7	I-Operating_System
and	O
later	O
,	O
AirDrop	B-Operating_System
can	O
be	O
accessed	O
by	O
either	O
tapping	O
on	O
Settings	O
>	O
General	O
>	O
AirDrop	B-Operating_System
,	O
or	O
via	O
the	O
Control	B-Operating_System
Center	I-Operating_System
.	O
</s>
<s>
Both	O
Wi-Fi	O
and	O
Bluetooth	B-Protocol
are	O
automatically	O
switched	O
on	O
when	O
AirDrop	B-Operating_System
is	O
enabled	O
as	O
they	O
are	O
both	O
utilized	O
.	O
</s>
<s>
Options	O
for	O
controlling	O
AirDrop	B-Operating_System
discovery	O
by	O
other	O
devices	O
include	O
:	O
</s>
<s>
If	O
an	O
application	O
implements	O
AirDrop	B-Operating_System
support	O
,	O
it	O
is	O
available	O
through	O
the	O
share	O
button	O
.	O
</s>
<s>
AirDrop	B-Operating_System
is	O
subject	O
to	O
a	O
number	O
of	O
restrictions	O
on	O
iOS	B-Application
,	O
such	O
as	O
the	O
inability	O
to	O
share	O
music	O
or	O
videos	O
from	O
the	O
native	O
apps	O
.	O
</s>
<s>
On	O
Macs	O
running	O
OS	B-Application
X	I-Application
10.7	I-Application
and	O
greater	O
,	O
AirDrop	B-Operating_System
is	O
available	O
in	O
the	O
Finder	B-Application
window	O
sidebar	O
.	O
</s>
<s>
On	O
Macs	O
running	O
OS	O
X	O
10.8.1	O
or	O
later	O
,	O
it	O
can	O
also	O
be	O
accessed	O
through	O
the	O
menu	O
option	O
Go	O
→	O
AirDrop	B-Operating_System
or	O
by	O
pressing	O
++	O
.	O
</s>
<s>
AirDrop	B-Operating_System
must	O
be	O
selected	O
in	O
a	O
Finder	B-Application
window	O
sidebar	O
to	O
be	O
able	O
to	O
transfer	O
files	O
.	O
</s>
<s>
Running	O
iOS	B-Operating_System
7	I-Operating_System
or	O
later	O
:	O
</s>
<s>
AirDrop	B-Operating_System
can	O
be	O
enabled	O
unofficially	O
on	O
iPad	B-Operating_System
(	O
3rd	O
generation	O
)	O
.	O
</s>
<s>
Although	O
not	O
supported	O
by	O
default	O
,	O
AirDrop	B-Operating_System
can	O
be	O
enabled	O
by	O
jailbreaking	B-Application
the	O
device	O
and	O
installing	O
"	O
AirDrop	B-Operating_System
Enabler	O
7.0	O
+	O
"	O
from	O
Cydia	B-Device
.	O
</s>
<s>
This	O
procedure	O
is	O
not	O
condoned	O
by	O
Apple	O
,	O
as	O
engaging	O
in	O
jailbreaking	B-Application
can	O
cause	O
software	O
instability	O
,	O
and	O
can	O
introduce	O
a	O
conduit	O
to	O
install	O
viruses	O
.	O
</s>
<s>
Running	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
(	O
10.7	B-Application
)	O
or	O
later	O
:	O
</s>
<s>
To	O
transfer	O
files	O
between	O
a	O
Mac	O
and	O
an	O
iPhone	B-Operating_System
,	O
iPad	B-Operating_System
or	O
iPod	B-Operating_System
touch	I-Operating_System
,	O
the	O
following	O
minimum	O
requirements	O
have	O
to	O
be	O
met	O
:	O
All	O
iOS	B-Application
devices	O
with	O
AirDrop	B-Operating_System
are	O
supported	O
with	O
iOS	B-Operating_System
8	I-Operating_System
or	O
later	O
:	O
</s>
<s>
Running	O
OS	B-Device
X	I-Device
Yosemite	I-Device
(	O
10.10	O
)	O
or	O
later	O
:	O
</s>
<s>
Bluetooth	B-Protocol
and	O
Wi-Fi	O
have	O
to	O
be	O
turned	O
on	O
for	O
both	O
Mac	O
and	O
iOS	B-Application
devices	O
.	O
</s>
<s>
AirDrop	B-Operating_System
uses	O
TLS	B-Protocol
encryption	I-Protocol
over	O
a	O
direct	O
Apple-created	O
peer-to-peer	O
Wi-Fi	O
connection	O
for	O
transferring	B-Protocol
files	I-Protocol
.	O
</s>
<s>
The	O
Wi-Fi	O
radios	O
of	O
the	O
source	O
and	O
target	O
devices	O
communicate	O
directly	O
without	O
using	O
an	O
Internet	O
connection	O
or	O
Wi-Fi	B-Device
Access	I-Device
Point	I-Device
.	O
</s>
<s>
During	O
the	O
initial	O
handshake	O
devices	O
exchange	O
full	O
SHA-256	B-Algorithm
hashes	O
of	O
users	O
 '	O
phone	O
numbers	O
and	O
email	O
addresses	O
,	O
which	O
might	O
be	O
used	O
by	O
attackers	O
to	O
infer	O
the	O
phone	O
numbers	O
and	O
in	O
some	O
cases	O
email	O
addresses	O
themselves	O
.	O
</s>
<s>
Following	O
the	O
2022	O
Beijing	O
Sitong	O
Bridge	O
protest	O
,	O
users	O
in	O
China	O
used	O
AirDrop	B-Operating_System
to	O
distribute	O
similar	O
protest	O
posters	O
and	O
slogans	O
.	O
</s>
<s>
Apple	O
reportedly	O
limited	O
the	O
AirDrop	B-Operating_System
function	O
in	O
China	O
just	O
weeks	O
before	O
2022	O
COVID-19	O
protests	O
in	O
China	O
.	O
</s>
<s>
The	O
AirDrop	B-Operating_System
restrictions	O
triggered	O
a	O
hunger	O
strike	O
at	O
Apple	O
's	O
headquarters	O
.	O
</s>
<s>
There	O
have	O
been	O
numerous	O
reported	O
cases	O
where	O
iOS	B-Application
device	O
users	O
with	O
AirDrop	B-Operating_System
privacy	O
set	O
to	O
"	O
Everyone	O
"	O
have	O
received	O
unwanted	O
files	O
from	O
nearby	O
strangers	O
;	O
the	O
phenomenon	O
has	O
been	O
termed	O
"	O
cyber-flashing.	O
"	O
</s>
<s>
As	O
of	O
iOS	B-Application
16.1.1	O
,	O
Apple	O
has	O
silently	O
replaced	O
the	O
"	O
Everyone	O
"	O
mode	O
with	O
"	O
Everyone	O
for	O
10	O
minutes	O
"	O
for	O
users	O
in	O
China	O
,	O
which	O
automatically	O
reverts	O
back	O
to	O
contacts	O
only	O
after	O
time	O
elapses	O
.	O
</s>
<s>
In	O
May	O
2022	O
,	O
an	O
AnadoluJet	O
flight	O
between	O
Israel	O
and	O
Turkey	O
was	O
deboarded	O
after	O
Israeli	O
users	O
used	O
AirDrop	B-Operating_System
to	O
share	O
pictures	O
of	O
a	O
Turkish	O
airline	O
crash	O
,	O
leading	O
to	O
at	O
least	O
one	O
injury	O
to	O
a	O
passenger	O
.	O
</s>
