LAUSR

In recent years, there has been a lot of research interest in analysing chaotic constructions and their associated cryptographic structures. Compared with the essential combination of encryption and signature, the signcryption scheme has a more realistic solution for achieving message confidentiality and authentication simultaneously. However, the security of such schemes is questionable when deployed in modern safety-critical systems, especially as billions of sensitive user information is transmitted over open communication channels. To address this limitation, a lightweight, provably secure certificateless technique that uses Fractional Chaotic Maps (FCM) for group-oriented signcryption (CGST) is presented. The main feature of the CGST-FCM technique is that any group signcrypter may encrypt data/information with the group manager (GM) and have it sent to the verifier. They can verify the legitimacy of the signcrypted information/data using the public conditions of the group, but they cannot link it to the conforming signcrypter. In this scenario, valid signcrypted information/data cannot be produced by the GM or any signcrypter in that category alone. The GM is allowed to reveal the identity of the signcrypter when there is a legal conflict to restrict repudiation of the signature. The CGST-FCM technique is found to be protected from the indistinguishably chosen ciphertext attack (IND-CCA). The computationally difficult problem has been used to build unlinkability, traceability, robust security, and unforgeability. The security investigation of the presented CGST-FCM technique shows commendable consistency and very high efficiency when used in real-time security applications.