An Improved Proxy Re-Encryption Scheme for IoT-Based Data Outsourcing Services in Clouds by Han-Yu Lin, Yao-Min Hung

“…The proposed scheme is provably secure assuming the hardness of the bilinear inverse Diffie–Hellman problem (BIDHP). In particular, our scheme is bidirectional and supports the functionality of multi-hop, which allows an uploaded ciphertext to be transformed into a different one multiple times. …”
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