Certificateless Multi-signcryption Scheme in Standard Model

A signcryption scheme can realize the security objectives of confidentiality and integrity simultaneously, which has lower computational cost and communication overhead than the sign-then-encrypt approach. To adapt multi-user settings and solve key escrow problem of ID-based multi-signcryption schemes, we defined the formal model of certificatless multi-signcryption scheme and proposed a certificateless multi-signcryption scheme in the standard model. The scheme can be proven secure without random oracles, and performance analysis shows that the proposed scheme is efficient.