Recently, Pan et al. proposed the “Public-Key Authenticated Encryption with Keyword Search Achieving both Multi-Ciphertext and Multi-Trapdoor Indistinguishability” in Pan and Li (2021). However, after carefully revisiting the scheme, we found an attack on Pan et al.’s scheme. As a result, the multi-ciphertext indistinguishability of their scheme is totally broken. In addition, we also pointed out a serious mistake in the security proof of multi-trapdoor indistinguishability in Pan’s scheme.

中文翻译：

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潘等人的“用关键字搜索实现多密文和多陷门不可区分性的公钥认证加密”的安全分析

最近，潘等人。Pan and Li (2021) 提出了“Public-Key Authenticated Encryption with Keyword Search Achieving both Multi-Ciphertext and Multi-Trapdoor Indistinguishability”。然而，在仔细重新审视该方案后，我们发现了对潘等人方案的攻击。结果，他们的方案的多密文不可区分性被完全打破了。此外，我们还指出了潘的方案中多陷门不可区分性的安全证明存在严重错误。