Leakage-Resilient Anonymous Multi-Recipient Signcryption Under a Continual Leakage Model

A multi-recipient signcryption (MRSC) scheme possesses the functionalities of both public-key encryption and digital signature to ensure integrity confidentiality transmitted messages. Moreover, an anonymous MRSC (AMRSC) retains while offering privacy-preserving, namely, a recipient’s identity or public key being hidden other recipients. In past, numerous AMRSC schemes based on various cryptographies (i.e., infrastructure (PKI)-based, (ID)-based certificateless (CL)) were proposed. Recently, attacker can realize side-channel attacks acquire partial bits private keys participated in cryptographic computations. However, up date, no resist so that these might suffer from such could be broken. To under continual leakage model, we propose first PKI-based leakage-resilient (PKI-LR-AMRSC) this paper. proposed scheme, is permitted continually partook computations PKI-LR-AMRSC formal security proofs are given show still original schemes. As compared with relevant schemes, our not only resists but also reduces cost executing multi-signcryption unsigncryption algorithms. particular, point computational complexities respectively require xmlns:xlink="http://www.w3.org/1999/xlink">O ( xmlns:xlink="http://www.w3.org/1999/xlink">t ) (1) Multi-signcryption algorithm Unsigncryption algorithm, where t number