Abstract: Techniques are provided for delegating evaluation of pseudorandom functions to a proxy. A delegator delegates evaluation of a pseudorandom function to a proxy, by providing a trapdoor ? to the proxy based on a secret key k and a predicate P using an algorithm T, wherein the predicate P defines a plurality of values for which the proxy will evaluate the pseudorandom function, wherein the plurality of values comprise a subset of a larger domain of values, and wherein the trapdoor ? provides an indication to the proxy of the plurality of values. A proxy evaluates a pseudorandom function delegated by a delegator by receiving a trapdoor ? from the delegator that provides an indication of a plurality of values to be evaluated, wherein the plurality of values comprise a subset of a larger domain of values; and evaluating an algorithm C on the trapdoor ? to obtain the pseudorandom function value for each of the plurality of values.