Anonymous Identity-Based Encryption with Bounded Leakage Resilience

Memory attacks, inspired by recent realistic physical attacks, have broken many cryptographic schemes which were considered secure. In this paper, we consider the memory leakage resilience in anonymous identity-based encryption schemes. We construct a leakage-resilient anonymous identity based encryption scheme based on dual system encryption. Inspired by Lewko et al.'s techniques, our scheme is built in composite order groups which have four prime order subgroups and blind the public parameters and cipher texts using the random elements of same subgroup to achieve the anonymity. Moreover, we analyze the security of our scheme in the full adaptive-ID model rather than the selective-ID model.