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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Generic Transforms to Acquire CCA-Security for Identity Based Encryption: The Cases of FOpkc and REACT
verfasst von : Takashi Kitagawa, Peng Yang, Goichiro Hanaoka, Rui Zhang, Hajime Watanabe, Kanta Matsuura, Hideki Imai
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
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Fujisaki-Okamoto (FO
pkc
) conversion [13] and REACT[17] are widely known to be able to generically convert a weak public key encryption scheme to a strong encryption scheme. In this paper, we discuss applications of FO
pkc
conversion and REACT to Identity Based Encryptions (IBE). It has not been formally verified yet that whether these conversions are generic in the IBE setting.
Our results show that both conversions are effective in the IBE case: plain REACT already achieves a good security reduction while the plain FO
pkc
conversion results in bad running time of the simulator. We further propose a simple modification to the plain FO
pkc
that solves this problem. Finally, we choose some concrete parameters to explain (visually) the effect of how the modified FO
pkc
substantially improves reduction cost regarding the plain conversion.