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- W1520405940 abstract "We show that Katz-Wang’s duplicating key and ciphertext technique can be extended to a generic method that can be used in a certain category of Identity-Based Encryption (IBE) schemes for the purposes of improving their security reductions. We further develop two refined approaches by adapting the randomness reuse technique in the Katz-Wang technique: one is public key duplication, and the other is master key duplication. Compared to the Katz-Wang technique, our two refined approaches do not only improve the performances of the resulting IBE schemes but also enable a reduction algorithm to deal with decryption queries correctly and therefore can achieve chosen ciphertext security. As case studies, we apply these two approaches to modify the Boneh-Franklin IBE scheme and the Boneh-Boyen IBE scheme, respectively. Both of the modifications improve the tightness of security reductions, compared to the original schemes, with a reasonably low cost." @default.
- W1520405940 created "2016-06-24" @default.
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- W1520405940 date "2011-01-01" @default.
- W1520405940 modified "2023-09-23" @default.
- W1520405940 title "Generic Methods to Achieve Tighter Security Reductions for a Category of IBE Schemes" @default.
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- W1520405940 doi "https://doi.org/10.1007/978-3-642-21031-0_4" @default.
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