| 摘要 |
A computing apparatus outputs tau1 and tau2 corresponding to a ciphertext x, a capability providing apparatus uses tau1 to correctly compute f(tau1) with a probability greater than a certain probability and sets the result of the computation as z1, uses tau2 to correctly compute f(tau2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub'va' if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for xepsilonH, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.
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