Cryptanalytic evaluation demonstrates keyword information leakage in a blockchain-based medical data sharing scheme, highlighting critical privacy vulnerabilities.
Banik and Kumar (Journal of Information Security and Applications 2023) proposed a blockchain-based public key encryption with keyword search for medical data sharing in cloud environments. In this comment paper, we show that the Banik-Kumar scheme leaks keyword information from both ciphertexts and trapdoors.
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Emura et al. (2026) studied this question.
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