NDLI: Reflections on the security proofs of Boneh-Franklin identity-based encryption scheme

Content Provider	Springer Nature Link
Author	Chen, Yu Chen, LiQun Lin, DongDai
Copyright Year	2013
Abstract	In this paper, we first review the existing proofs of the Boneh-Franklin identity-based encryption scheme (BF-IBE for short), and show how to admit a new proof by slightly modifying the specifications of the hash functions of the original BF-IBE. Compared with prior proofs, our new proof provides a tighter security reduction and minimizes the use of random oracles, thus indicates BF-IBE has better provable security with our new choices of hash functions. The techniques developed in our proof can also be applied to improving security analysis of some other IBE schemes. As an independent technical contribution, we also give a rigorous proof of the Fujisaki-Okamoto (FO) transformation in the case of CPA-to-CCA, which demonstrates the efficiency of the FO-transformation (CPA-to-CCA), in terms of the tightness of security reduction, has long been underestimated. This result can remarkably benefit the security proofs of encryption schemes using the FO-transformation for CPA-to-CCA enhancement.
Starting Page	1385
Ending Page	1401
Page Count	17
File Format	PDF
ISSN	16747283
Journal	Science in China Series A: Mathematics
Volume Number	56
Issue Number	7
e-ISSN	18691862
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-07-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	identity-based encryption Fujisaki-Okamoto transformation provable security cascading reduction Applications of Mathematics
Content Type	Text
Resource Type	Article
Subject	Mathematics

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Reflections on the security proofs of Boneh-Franklin identity-based encryption scheme

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