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Identity-based encryption (IBE), introduced by Shamir, has a major issue, which is that the private key generator (PKG) can decrypt any ciphertext with the master secret key. This problem is called the inherent key escrow in IBE schemes. To solve this problem, Gentry proposed certificate-based encryption. In this paper, from the idea of Gentry we propose two IBE schemes, which can avoid key escrow...
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