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This paper presents the first multi-use unidirectional proxy re-encryption scheme proven-secure against chosen-ciphertext attacks and collusion attacks in the standard model. Although the authors' proposal features a linear ciphertext size and decryption time in the number of transformations, they emphasize that it is the first multi-use and unidirectional realization of the primitive satisfying the chosen-ciphertext security and collusion resistance. The proposal gives an answer to the problem proposed by Canetti and Hohenberger at ACM CCS 2007.
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