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PKC
2016
Springer

Extended Nested Dual System Groups, Revisited

8 years 7 months ago
Extended Nested Dual System Groups, Revisited
The notion of extended nested dual system groups (ENDSG) was recently proposed by Hofheinz et al. [PKC 2015] for constructing almost-tight identity based encryptions (IBE) in the multi-instance, multi-ciphertext (MIMC) setting. However only a composite-order instantiation was proposed and more efficient prime-order instantiations are absent. The paper fills the blank by presenting two constructions. We revise the definition of ENDSG and realize it using prime-order bilinear groups based on Chen and Wee’s prime-order instantiation of nested dual system groups [CRYPTO 2013]. This yields the first almosttight IBE in the prime-order setting achieving weak adaptive security in MIMC scenario under the d-linear (d-Lin) assumption. We further enhanced the revised ENDSG to capture stronger security notions for IBE, including B-weak adaptive security and full adaptive security. We show that our prime-order instantiation is readily B-weak adaptive secure and full adaptive secure without in...
Junqing Gong, Jie Chen 0021, Xiaolei Dong, Zhenfu
Added 08 Apr 2016
Updated 08 Apr 2016
Type Journal
Year 2016
Where PKC
Authors Junqing Gong, Jie Chen 0021, Xiaolei Dong, Zhenfu Cao, Shaohua Tang
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