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Secret Sharing and Secure Computation
Splitting a secret so that any t shares reveal it and any t−1 reveal nothing, and computing on data nobody is allowed to see.
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In the millionaires' problem
f
(
x
,
y
)
=
1
f(x,y) = 1
f
(
x
,
y
)
=
1
if
x
>
y
x > y
x
>
y
and
0
0
0
otherwise. Alice holds
x
=
7
x = 7
x
=
7
and Bob holds
y
=
5
y = 5
y
=
5
.
What is the output?
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x
y
f
( )
x
n
√
⌫
AC
7
8
9
+
4
5
6
−
1
2
3
×
0
.
a
b
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