<s>
Dropbear	B-Protocol
is	O
a	O
software	O
package	O
written	O
by	O
Matt	O
Johnston	O
that	O
provides	O
a	O
Secure	O
Shell-compatible	O
server	O
and	O
client	O
.	O
</s>
<s>
It	O
is	O
designed	O
as	O
a	O
replacement	O
for	O
standard	O
OpenSSH	B-Language
for	O
environments	O
with	O
low	O
memory	O
and	O
processor	O
resources	O
,	O
such	O
as	O
embedded	B-Architecture
systems	I-Architecture
.	O
</s>
<s>
It	O
is	O
a	O
core	O
component	O
of	O
OpenWrt	B-Application
and	O
other	O
router	O
distributions	O
.	O
</s>
<s>
Dropbear	B-Protocol
was	O
originally	O
released	O
in	O
April	O
2003	O
.	O
</s>
<s>
Dropbear	B-Protocol
implements	O
version	O
2	O
of	O
the	O
Secure	B-Protocol
Shell	I-Protocol
(	O
SSH	B-Protocol
)	O
protocol	O
.	O
</s>
<s>
The	O
cryptographic	O
algorithms	O
are	O
implemented	O
using	O
third-party	O
cryptographic	O
libraries	O
like	O
LibTomCrypt	O
included	O
internally	O
in	O
the	O
Dropbear	B-Protocol
distribution	O
.	O
</s>
<s>
It	O
derives	O
some	O
parts	O
from	O
OpenSSH	B-Language
to	O
handle	O
BSD-style	O
pseudo	B-Protocol
terminals	I-Protocol
.	O
</s>
<s>
Dropbear	B-Protocol
implements	O
the	O
complete	O
SSH	B-Protocol
version	O
2	O
protocol	O
in	O
both	O
the	O
client	O
and	O
the	O
server	O
.	O
</s>
<s>
It	O
does	O
not	O
support	O
SSH	B-Protocol
version	O
1	O
backwards-compatibility	B-General_Concept
in	O
order	O
to	O
save	O
space	O
and	O
resources	O
,	O
and	O
to	O
avoid	O
the	O
inherent	O
security	O
vulnerabilities	O
in	O
SSH	B-Protocol
version	O
1	O
.	O
</s>
<s>
SFTP	O
support	O
relies	O
on	O
a	O
binary	O
file	O
which	O
can	O
be	O
provided	O
by	O
OpenSSH	B-Language
or	O
similar	O
programs	O
.	O
</s>
<s>
FISH	B-Protocol
works	O
in	O
any	O
case	O
and	O
is	O
supported	O
by	O
Konqueror	B-Application
.	O
</s>
<s>
Dropbear	B-Protocol
supports	O
elliptic	O
curve	O
cryptography	O
for	O
key	O
exchange	O
,	O
as	O
of	O
version	O
2013.61test	O
and	O
beyond	O
.	O
</s>
