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Often authentication and confidentiality are required as simultaneous key requirements in many cryptographic applications. The cryptographic primitive called signcryption effectively implements the same and while most of the public key based systems are appropriate for small messages, hybrid encryption (KEM-DEM) provides an efficient and practical way to securely communicate very large messages. Recently, Lippold et al. proposed a certificateless KEM in the standard model and the first certificateless hybrid signcryption scheme was proposed by Fagen Li et al. The concept of certificateless hybrid signcryption has evolved by combining the ideas of signcryption based on tag-KEM and certificateless cryptography.
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