<s>
OSSEC	B-Protocol
(	O
Open	O
Source	O
HIDS	O
SECurity	O
)	O
is	O
a	O
free	B-Application
,	O
open-source	B-Application
host-based	O
intrusion	O
detection	O
system	O
(	O
HIDS	O
)	O
.	O
</s>
<s>
It	O
performs	O
log	B-Application
analysis	I-Application
,	O
integrity	O
checking	O
,	O
Windows	B-Protocol
registry	I-Protocol
monitoring	O
,	O
rootkit	O
detection	O
,	O
time-based	O
alerting	O
,	O
and	O
active	O
response	O
.	O
</s>
<s>
It	O
provides	O
intrusion	O
detection	O
for	O
most	O
operating	O
systems	O
,	O
including	O
Linux	B-Application
,	O
OpenBSD	B-Operating_System
,	O
FreeBSD	B-Operating_System
,	O
OS	B-Operating_System
X	I-Operating_System
,	O
Solaris	B-Application
and	O
Windows	B-Application
.	O
</s>
<s>
OSSEC	B-Protocol
has	O
a	O
centralized	O
,	O
cross-platform	B-Operating_System
architecture	O
allowing	O
multiple	O
systems	O
to	O
be	O
easily	O
monitored	O
and	O
managed	O
.	O
</s>
<s>
OSSEC	B-Protocol
has	O
a	O
log	B-Application
analysis	I-Application
engine	O
that	O
is	O
able	O
to	O
correlate	O
and	O
analyze	O
logs	O
from	O
multiple	O
devices	O
and	O
formats	O
.	O
</s>
<s>
In	O
June	O
2008	O
,	O
the	O
OSSEC	B-Protocol
project	O
and	O
all	O
the	O
copyrights	O
owned	O
by	O
Daniel	O
B	O
.	O
Cid	O
,	O
the	O
project	O
leader	O
,	O
were	O
acquired	O
by	O
Third	O
Brigade	O
,	O
Inc	O
.	O
</s>
<s>
They	O
promised	O
to	O
continue	O
to	O
contribute	O
to	O
the	O
open	O
source	O
community	O
and	O
to	O
extend	O
commercial	O
support	O
and	O
training	O
to	O
the	O
OSSEC	B-Protocol
open	O
source	O
community	O
.	O
</s>
<s>
In	O
May	O
2009	O
,	O
Trend	O
Micro	O
acquired	O
Third	O
Brigade	O
and	O
the	O
OSSEC	B-Protocol
project	O
,	O
with	O
promises	O
to	O
keep	O
it	O
open	O
source	O
and	O
free	B-Application
.	O
</s>
<s>
In	O
2018	O
,	O
Trend	O
released	O
the	O
domain	O
name	O
and	O
source	O
code	O
to	O
the	O
OSSEC	B-Protocol
Foundation	O
.	O
</s>
<s>
The	O
OSSEC	B-Protocol
project	O
is	O
currently	O
maintained	O
by	O
Atomicorp	O
who	O
stewards	O
the	O
free	B-Application
and	O
open	O
source	O
version	O
and	O
also	O
offers	O
a	O
commercial	O
version	O
.	O
</s>
<s>
OSSEC	B-Protocol
consists	O
of	O
a	O
main	O
application	O
,	O
an	O
agent	B-General_Concept
,	O
and	O
a	O
web	O
interface	O
.	O
</s>
<s>
Manager	O
(	O
or	O
server	O
)	O
,	O
which	O
is	O
required	O
for	O
distributed	O
network	O
or	O
stand-alone	B-Application
installations	O
.	O
</s>
<s>
Agent	B-General_Concept
,	O
a	O
small	O
program	O
installed	O
on	O
the	O
systems	O
to	O
be	O
monitored	O
.	O
</s>
<s>
Agentless	B-General_Concept
mode	O
,	O
can	O
be	O
used	O
to	O
monitor	O
firewalls	O
,	O
routers	O
,	O
and	O
even	O
Unix	O
systems	O
.	O
</s>
<s>
File	O
Integrity	O
Monitoring	O
(	O
FIM	O
)	O
:	O
For	O
both	O
files	O
and	O
windows	B-Protocol
registry	I-Protocol
settings	O
in	O
real	O
time	O
not	O
only	O
detects	O
changes	O
to	O
the	O
system	O
,	O
it	O
also	O
maintains	O
a	O
forensic	O
copy	O
of	O
the	O
data	O
as	O
it	O
changes	O
over	O
time	O
.	O
</s>
<s>
Since	O
2017	O
,	O
Atomicorp	O
has	O
been	O
running	O
the	O
annual	O
OSSEC	B-Protocol
Conference	O
,	O
where	O
all	O
active	O
developers	O
and	O
members	O
of	O
the	O
community	O
get	O
together	O
to	O
discuss	O
OSSEC	B-Protocol
and	O
its	O
future	O
.	O
</s>
<s>
The	O
2019	O
OSSEC	B-Protocol
Con	O
was	O
held	O
March	O
20-21st	O
outside	O
Washington	O
DC	O
.	O
</s>
