Quantum security of the Fujisaki-Okamoto transform (QCrypt 2015)
Ehsan Ebrahimi Targhi, Dominique Unruh
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In this paper, we present a hybrid encryption scheme that is chosen ciphertext secure in the quantum random oracle model. Our scheme is a combination of an asymmetric and a symmetric encryption scheme that are secure in a weak sense. It is a slight modification of Fujisaki and Okamoto’s transformation that is secure against classical adversaries.