<s>
An	O
undeniable	B-Algorithm
signature	I-Algorithm
is	O
a	O
digital	O
signature	O
scheme	O
which	O
allows	O
the	O
signer	O
to	O
be	O
selective	O
to	O
whom	O
they	O
allow	O
to	O
verify	O
signatures	O
.	O
</s>
<s>
The	O
designated	B-Algorithm
verifier	I-Algorithm
signature	I-Algorithm
scheme	O
improves	O
upon	O
deniable	O
signatures	O
by	O
allowing	O
,	O
for	O
each	O
signature	O
,	O
the	O
interactive	O
portion	O
of	O
the	O
scheme	O
to	O
be	O
offloaded	O
onto	O
another	O
party	O
,	O
a	O
designated	O
verifier	O
,	O
reducing	O
the	O
burden	O
on	O
the	O
signer	O
.	O
</s>
