<s>
By	O
using	O
this	O
representation	O
,	O
exponentiations	O
by	O
powers	O
of	O
2	O
can	O
be	O
accomplished	O
by	O
cyclic	B-Algorithm
shifts	I-Algorithm
.	O
</s>
<s>
K	O
.	O
Sakurai	O
and	O
H	O
.	O
Shizuya	O
show	O
that	O
under	O
certain	O
assumptions	O
breaking	O
Massey	O
–	O
Omura	O
cryptosystem	O
is	O
equivalent	O
to	O
the	O
Diffie	B-Protocol
–	I-Protocol
Hellman	I-Protocol
assumption	O
.	O
</s>
