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Detectable Chosen Cipher text Security (DCCA security) is a security notion for Public-Key Encryptions proposed recently in [1]. A DCCA-secure encryption is not necessarily CCA-secure, but dangerous decryption queries can be detected and are not allowed to be requested to the decryption oracle. DCCA-secure schemes may helps in constructing of CCA-secure ones. In this paper, we show there are already...
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