CCA-secure leakage-resilient identity-based key-encapsulation from simple (Not q-type) assumptions

Abstract

In this paper, we propose a new leakage-resilient identity-based encryption (IBE) scheme that is secure against chosen-ciphertext attacks (CCA) in the bounded memory leakage model. It is the first CCA-secure leakage-resilient IBE scheme which does not depend on q-type assumptions. More precisely, it is secure under the DLIN assumption for symmetric bilinear groups and under the XDLIN assumption for asymmetric bilinear groups, respectively.