Constant-size CCA-secure multi-hop unidirectional proxy re-encryption from indistinguishability obfuscation

Abstract

In this paper, we utilize the recent advances in indistinguishability obfuscation, overcome several obstacles and propose a multi-hop unidirectional proxy re-encryption scheme. The proposed scheme is proved to be CCA-secure in the standard model (i.e., without using the random oracle heuristic), and its ciphertext remains constant-size regardless of how many times it has been transformed.