<s>
Group-based	B-Algorithm
cryptography	I-Algorithm
is	O
a	O
use	O
of	O
groups	O
to	O
construct	O
cryptographic	O
primitives	O
.	O
</s>
<s>
In	O
particular	O
Diffie	B-Protocol
–	I-Protocol
Hellman	I-Protocol
key	I-Protocol
exchange	I-Protocol
uses	O
finite	O
cyclic	O
groups	O
.	O
</s>
<s>
So	O
the	O
term	O
group-based	B-Algorithm
cryptography	I-Algorithm
refers	O
mostly	O
to	O
cryptographic	O
protocols	O
that	O
use	O
infinite	O
nonabelian	O
groups	O
such	O
as	O
a	O
braid	B-Application
group	I-Application
.	O
</s>
