<s>
Anshel	O
–	O
Anshel	O
–	O
Goldfeld	O
protocol	O
,	O
also	O
known	O
as	O
a	O
commutator	B-Protocol
key	I-Protocol
exchange	I-Protocol
,	O
is	O
a	O
key-exchange	O
protocol	O
using	O
nonabelian	O
groups	O
.	O
</s>
<s>
It	O
is	O
often	O
discussed	O
specifically	O
in	O
application	O
of	O
braid	B-Application
groups	I-Application
,	O
which	O
notably	O
are	O
infinite	O
(	O
and	O
the	O
group	O
elements	O
can	O
take	O
variable	O
quantities	O
of	O
space	O
to	O
represent	O
)	O
.	O
</s>
<s>
Solving	O
for	O
a	O
suitable	O
given	O
the	O
conjugation	O
relations	O
is	O
called	O
the	O
conjugation	O
problem	O
,	O
and	O
substantial	O
research	O
has	O
been	O
done	O
on	O
attacks	O
to	O
the	O
conjugacy	O
problem	O
on	O
braid	B-Application
groups	I-Application
,	O
although	O
no	O
full	O
efficient	O
solution	O
has	O
achieved	O
.	O
</s>
