On the Fujisaki-Okamoto transform: from Classical CCA Security to Quantum CCA Security

ePrint Report: On the Fujisaki-Okamoto transform: from Classical CCA Security to Quantum CCA Security

Jiangxia Ge, Tianshu Shan, Rui Xue

The Fujisaki-Okamoto (\textsf{FO}) transformation (CRYPTO 1999 and Journal of Cryptology 2013) and its KEM variants (TCC 2017) are used to construct \textsf{IND-CCA}-secure PKE or KEM schemes in the random oracle model (ROM).


In the post-quantum setting, the ROM is extended to the quantum random oracle model (QROM), and the \textsf{IND-CCA} security of \textsf{FO} transformation and its KEM variants in the …

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