An Identity-Based Key-Insulated Encryption with Message Linkages for Peer-to-Peer Communication Network
Chien-Lung Hsu, Han-Yu Lin · KSII Transactions on Internet and Information Systems · 2013
Key exposure is a major threat to secure cryptosystems.To mitigate the impact caused by key-compromise attacks, a key-insulated cryptographic mechanism is a better alternative.For securing the large message communication in peer-to-peer networks, in this paper, we propose the first novel identity-based key-insulated encryption (IB-KIE) scheme with message linkages.Our scheme has the properties of unbounded time periods and random-access key-updates.In the proposed scheme, each client can periodically update his private key while the corresponding public one remains unchanged.The essential security assumption of our proposed scheme is based on the well-known bilinear Diffie-Hellman problem (BDHP).To ensure the practical feasibility, we also formally prove that the proposed scheme achieves the security requirement of confidentiality against indistinguishability under adaptive chosen-ciphertext attacks (IND-CCA2) in the random oracle model.