The scheme has adaptively chosen ciphertext security in the random oracle model.

并在随机谕示模型下，证明了方案具有选择密文安全性。

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The formal security proof of this scheme is provided in the random oracle model.

我们在随机预言模型下给出了方案的安全性证明。

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Then we prove that our scheme satisfies these security notions in the random oracle model.

我们证明该方案在随机预言机模型中是可证安全的。

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