Secure certificateless signature resisting to continual leakage attacks

Abstract

Recently, numerous leakage-resilient cryptographic schemes have been proposed to resist side-channel attacks which adopt several properties resulting from practical implementations of cryptographic protocols/schemes to leak partial information of secret (or private) keys. Certificateless public key cryptography solves both certificate management problem in conventional public key cryptography and the key escrow problem in ID-based public key cryptography. However, there is little work on studying the design of certificateless cryptographic schemes resisting to side-channel attacks. In the article, the first leakage-resilient certificateless signature (LR-CLS) scheme is proposed. In the generic bilinear group model, the proposed scheme is demonstrated to possess existential unforgeability against adaptive chosen-message attacks under the continual leakage model for both Type I and Type II adversaries.