Abstract
We propose a generic method that transforms a weakly secure KEM, i.e. a KEM which is secure against constrained chosen ciphertext attack (CCCA), to a strongly secure KEM, i.e. a KEM which is secure against full chosen ciphertext attack (CCA). The proposed method does not depend on the random oracle nor any other non- standard assumptions. Using this method, we obtain new efficient hybrid encryption schemes based on Kurosawa&Desmedt and Hofheinz&Kiltz weakly secure KEMs. These are the first hybrid encryption schemes which are as efficient as Kurosawa&Desmedt and Hofheinz&Kiltz encryption schemes, but whose security can be explained in the original KEM/DEM framework.
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Baek, J., Galindo, D., Susilo, W., Zhou, J. (2008). Constructing Strong KEM from Weak KEM (or How to Revive the KEM/DEM Framework). In: Ostrovsky, R., De Prisco, R., Visconti, I. (eds) Security and Cryptography for Networks. SCN 2008. Lecture Notes in Computer Science, vol 5229. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85855-3_24
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DOI: https://doi.org/10.1007/978-3-540-85855-3_24
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