Key continual-leakage resilient broadcast cryptosystem from dual system in broadcast networks
Mingwu ZHANG1,2,*(),Yi MU3
1. School of Computer Sciences, Hubei University of Technology,Wuhan 430068, China 2. State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100093, China 3. School of Computer Science and Software Engineering, University of Wollongong, Wollongong NSW 2522, Australia
In order to tolerate possible leakage of secret keys, leakage-resilient cryptosystem models a class of attractive leakage output by allowing an adversary to provide any computable leakage function and learning the partial keys or other possible internal states from the output of function. In this work, we present an adaptively secure broadcast encryption resilient to key continual leakage in the standard model. Our scheme provides the tolerance of continual leakage, in which any user can generate multiple private keys per user by periodically updating the key. We use the dual system encryption mechanism to implement the leakage resilience and adaptive security, and intrinsically set an algorithm to refresh a key and produce a same distributed new key. We also give the evaluation of the leakage bound and leakage fraction, and the simulations show that our scheme can tolerate about 71% leakage fraction with 3.34 × 10-52 failure probability in standard 80-bit security level when we adjust the leakage factor to allow the private key to be 100 Kb.
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