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TCC
2010
Springer

New Techniques for Dual System Encryption and Fully Secure HIBE with Short Ciphertexts

14 years 7 months ago
New Techniques for Dual System Encryption and Fully Secure HIBE with Short Ciphertexts
We construct a fully secure HIBE scheme with short ciphertexts. The previous construction of Boneh, Boyen, and Goh was only proven to be secure in the selective model, under a non-static assumption which depended on the depth of the hierarchy. To obtain full security, we apply the dual system encryption concept recently introduced by Waters. A straightforward application of this technique is insufficient to achieve short ciphertexts, since the original instantiation of the technique includes tags that do not compress. To overcome this challenge, we design a new method for realizing dual system encryption. We provide a system in composite order groups (of three primes) and prove the security of our scheme under three static assumptions. ∗ Supported by National Defense Science and Engineering Graduate Fellowship. † Supported by NSF CNS-0716199, CNS-0915361 and Air Force Office of Scientific Research (AFO SR) under the MURI award for “Collaborative policies and assured information...
Allison B. Lewko, Brent Waters
Added 17 Mar 2010
Updated 17 Mar 2010
Type Conference
Year 2010
Where TCC
Authors Allison B. Lewko, Brent Waters
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