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AAECC
2006
Springer

Applying Fujisaki-Okamoto to Identity-Based Encryption

9 years 5 months ago
Applying Fujisaki-Okamoto to Identity-Based Encryption
The Fujisaki-Okamoto (FO) conversion is widely known to be able to generically convert a weak public key encryption scheme, say one-way against chosen plaintext attacks (OW-CPA), to a strong one, namely, indistinguishable against adaptive chosen ciphertext attacks (IND-CCA). It is not known that if the same holds for identity-based encryption (IBE) schemes, though many IBE and variant schemes are in fact specifically using the FO conversion. In this paper, we investigate this issue and confirm that the FO conversion is generically effective also in the IBE case. However, straightforward application of the FO conversion only leads to an IBE scheme with a loose (but polynomial) reduction. We then propose a simple modification to the FO conversion, which results in considerably more efficient security reduction.
Peng Yang 0002, Takashi Kitagawa, Goichiro Hanaoka
Added 13 Jun 2010
Updated 13 Jun 2010
Type Conference
Year 2006
Where AAECC
Authors Peng Yang 0002, Takashi Kitagawa, Goichiro Hanaoka, Rui Zhang 0002, Kanta Matsuura, Hideki Imai
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