CCA-Secure Leakage-Resilient Identity-Based Encryption without q-Type Assumptions
Toi Tomita, Wakaha Ogata, Kaoru Kurosawa, Ryo Kuwayama · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences · 2020
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. The security of our scheme is based on the external k-Linear assumption. It is the first CCA-secure leakage-resilient IBE scheme which does not depend on q-type assumptions. The leakage rate 1/10 is achieved under the XDLIN assumption (k=2).