Delegatable Pseudorandom Functions and Applications

Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
The authors put forth the problem of delegating the evaluation of a PseudoRandom Function (PRF) to an untrusted proxy and introduce a novel cryptographic primitive called Delegatable PseudoRandom Functions, or DPRFs for short: a DPRF enables a proxy to evaluate a PseudoRandom Function (PRF) on a strict subset of its domain using a trapdoor derived from the DPRF secret key. The trapdoor is constructed with respect to a certain policy predicate that determines the subset of input values which the proxy is allowed to compute.

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