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- W1969212979 abstract "Convertible authenticated encryption (CAE) schemes allow a signer to produce an authenticated ciphertext such that only a designated recipient can decrypt it and verify the recovered signature. The conversion property further enables the designated recipient to reveal an ordinary signature for dealing with a later dispute over repudiation. Based on the ElGamal cryptosystem, in 2009, Lee et al. proposed a CAE scheme with only heuristic security analyses. In this paper, we will demonstrate that their scheme is vulnerable to the chosen-plaintext attack and then further propose an improved variant. Additionally, in the random oracle model, we prove that the improved scheme achieves confidentiality against indistinguishability under adaptive chosen-ciphertext attacks (IND-CCA2) and unforgeability against existential forgery under adaptive chosen-message attacks (EF-CMA)." @default.
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- W1969212979 date "2011-07-01" @default.
- W1969212979 modified "2023-09-27" @default.
- W1969212979 title "Improved convertible authenticated encryption scheme with provable security" @default.
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- W1969212979 doi "https://doi.org/10.1016/j.ipl.2011.03.021" @default.
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