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In 1998, Blaze, Bleumer, and Strauss proposed a kind of cryptographic primitive called proxy re-encryption. In proxy re-encryption, a proxy can transform a ciphertext computed under Alice's public key into one that can be opened under Bob's decryption key. In this paper, we pay attention to the role of P KG for proxy re-encryption in identity based setting. We find that if we allow the PKG using its...
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