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Proxy re-encryption (PRE) has recently become a hot topic in cryptography research field. PRE can be classified as single-hop PRE and multi-use PRE according to the times the cipher text can be transformed. Finding a unidirectional, multi-use, and chosen cipher text attack (CCA) secure PRE is presented as an open problem by Green et al. Wang claimed to resolve this problem by proposing the first multi-use...