<s>
Winny	B-Protocol
(	O
also	O
known	O
as	O
WinNY	B-Protocol
)	O
is	O
a	O
Japanese	O
peer-to-peer	O
(	O
P2P	O
)	O
file-sharing	O
program	O
developed	O
by	O
Isamu	B-Protocol
Kaneko	I-Protocol
,	O
a	O
research	O
assistant	O
at	O
the	O
University	O
of	O
Tokyo	O
in	O
2002	O
.	O
</s>
<s>
Like	O
Freenet	B-Protocol
,	O
a	O
user	O
must	O
add	O
an	O
encrypted	O
node	O
list	O
in	O
order	O
to	O
connect	O
to	O
other	O
nodes	O
on	O
the	O
network	O
.	O
</s>
<s>
Users	O
choose	O
three	O
cluster	O
words	O
which	O
symbolize	O
their	O
interests	O
,	O
and	O
then	O
Winny	B-Protocol
connects	O
to	O
other	O
nodes	O
which	O
share	B-Application
these	O
cluster	O
words	O
,	O
downloading	O
and	O
storing	O
encrypted	O
data	O
from	O
cache	O
of	O
these	O
neighbors	O
in	O
a	O
distributed	O
data	O
store	O
.	O
</s>
<s>
If	O
users	O
want	O
a	O
particular	O
file	O
,	O
they	O
set	O
up	O
triggers	O
(	O
keywords	O
)	O
,	O
and	O
Winny	B-Protocol
will	O
download	O
files	O
marked	O
by	O
these	O
triggers	O
.	O
</s>
<s>
The	O
encryption	O
was	O
meant	O
to	O
provide	O
anonymity	O
,	O
but	O
Winny	B-Protocol
also	O
included	O
bulletin	O
boards	O
where	O
users	O
would	O
announce	O
uploads	O
,	O
and	O
the	O
IP	O
address	O
of	O
posters	O
could	O
be	O
discovered	O
through	O
these	O
boards	O
.	O
</s>
<s>
While	O
Freenet	B-Protocol
was	O
implemented	O
in	O
Java	B-Language
,	O
Winny	B-Protocol
was	O
implemented	O
as	O
a	O
Windows	O
C++	B-Language
application	O
.	O
</s>
<s>
The	O
software	O
takes	O
its	O
name	O
from	O
WinMX	B-Protocol
,	O
where	O
the	O
M	O
and	O
the	O
X	O
are	O
each	O
advanced	O
one	O
letter	O
in	O
the	O
Latin	O
alphabet	O
,	O
to	O
N	O
and	O
Y	O
.	O
Netagent	O
published	O
a	O
survey	O
in	O
June	O
2018	O
suggesting	O
that	O
Winny	B-Protocol
was	O
still	O
the	O
most	O
popular	O
p2p	O
network	O
in	O
Japan	O
ahead	O
of	O
Perfect	B-Application
Dark	I-Application
(	O
P2P	O
)	O
and	O
Share	B-Application
(	O
P2P	O
)	O
with	O
approximately	O
45,000	O
nodes	O
connecting	O
each	O
day	O
over	O
Golden	O
Week	O
.	O
</s>
<s>
The	O
number	O
of	O
nodes	O
on	O
Winny	B-Protocol
appears	O
to	O
be	O
holding	O
steady	O
compared	O
with	O
2015	O
.	O
</s>
<s>
Kaneko	O
first	O
announced	O
Winny	B-Protocol
on	O
the	O
Download	O
Software	O
board	O
of	O
the	O
2channel	O
(	O
2ch	O
for	O
short	O
)	O
Japanese	O
bulletin	O
board	O
site	O
.	O
</s>
<s>
After	O
Winny	B-Protocol
's	O
development	O
stopped	O
,	O
a	O
new	O
peer-to-peer	O
application	O
,	O
Share	B-Application
,	O
was	O
developed	O
to	O
be	O
a	O
successor	O
.	O
</s>
<s>
Since	O
August	O
2003	O
,	O
several	O
worms	O
called	O
"	O
Antinny	B-Protocol
"	O
have	O
spread	O
on	O
the	O
Winny	B-Protocol
network	O
.	O
</s>
<s>
Some	O
versions	O
of	O
Antinny	B-Protocol
work	O
as	O
follows	O
:	O
</s>
<s>
Upload	O
files	O
from	O
the	O
host	O
computer	O
onto	O
the	O
Winny	B-Protocol
network	O
.	O
</s>
<s>
Some	O
people	O
have	O
uploaded	O
their	O
information	O
unwittingly	O
from	O
their	O
computers	O
because	O
of	O
Antinny	B-Protocol
.	O
</s>
<s>
In	O
particular	O
,	O
a	O
defense	O
agency	O
was	O
forced	O
to	O
admit	O
that	O
classified	O
information	O
from	O
the	O
Maritime	O
Self	O
Defense	O
Force	O
was	O
uploaded	O
by	O
a	O
computer	O
with	O
Winny	B-Protocol
software	O
installed	O
on	O
it	O
.	O
</s>
<s>
A	O
similar	O
incident	O
occurred	O
with	O
JAL	O
Airlines	O
on	O
17	O
December	O
2005	O
,	O
after	O
a	O
virus	O
originating	O
from	O
Winny	B-Protocol
affected	O
the	O
computer	O
of	O
a	O
co-pilot	O
.	O
</s>
<s>
Perhaps	O
the	O
largest	O
Winny-related	O
leak	O
was	O
that	O
of	O
the	O
Okayama	O
Prefectural	O
Police	O
Force	O
,	O
whose	O
computer	O
leaked	O
data	O
about	O
around	O
1,500	O
investigations	O
.	O
</s>
<s>
On	O
November	O
28	O
,	O
2003	O
,	O
two	O
Japanese	O
users	O
of	O
Winny	B-Protocol
,	O
Yoshihiro	O
Inoue	O
,	O
a	O
41-year-old	O
self-employed	O
businessman	O
from	O
Takasaki	O
,	O
Gunma	O
Prefecture	O
and	O
an	O
unemployed	O
19-year-old	O
from	O
Matsuyama	O
,	O
were	O
arrested	O
by	O
the	O
Kyoto	O
Prefectural	O
Police	O
.	O
</s>
<s>
They	O
were	O
accused	O
of	O
sharing	O
copyrighted	O
material	O
via	O
Winny	B-Protocol
and	O
admitted	O
to	O
their	O
crimes	O
.	O
</s>
<s>
Shortly	O
following	O
the	O
two	O
users	O
 '	O
arrests	O
,	O
Kaneko	O
also	O
had	O
his	O
home	O
searched	O
and	O
had	O
the	O
source	O
code	O
of	O
Winny	B-Protocol
confiscated	O
by	O
the	O
Kyoto	O
Police	O
.	O
</s>
