Abstract:Detectable Chosen Ciphertext (DCCA) security is a useful notion to achieve CCA security for public-key encryptions (PKE). An "inner-outer" structure can transform a DCCA-secure PKE into a CCA-secure one. In the structure, the "inner" layer encrypts both the message and the two embedded randomness, so a key encapsulated mechanism (KEM) + data encapsulation mechanism (DEM) hybrid paradigm helps to gain time efficiency. Nevertheless, the long "inner" ciphertext still makes the "outer" encryption less efficient. W… Show more
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