Efficient Certificateless Online/Offline Signcryption Scheme Without Bilinear Pairing for Smart Home Consumer Electronics

Smart home refers to the automation and intelligent management of family life using information technology and Internet of Things technology, including various smart household appliances and low-power sensors. Low-power sensors can monitor the home environment and share data with household appliances, and users can remotely control household appliances through smartphones and other devices. With the popularity of consumer electronic devices, smart home has become an indispensable part of our life. Smart home data security and privacy leakage accidents occur frequently, how to protect data confidentiality and unforgeability for low-power smart home consumer electronics is a key problem. To solve this problem, scholars have proposed many cryptographic schemes. However, the existing schemes have low computational efficiency, high communication overhead, and poor adaptation to application scenarios. Therefore, to realize secure lightweight data sharing in smart home systems, we propose an efficient certificateless online/offline signcryption (CLOOSC) scheme without bilinear pairing. The performance analysis demonstrates that our scheme has an order of magnitude advantage in computation and communication overhead compared with bilinear pairing-based CLOOSC. Compared with the latest pairing-free CLOOSC scheme, our proposed approach significantly reduces the computational cost by one-third during the offline signcryption phase while maintaining the same communication overhead. The proposed cryptographic algorithm has made a substantial contribution to the data security sharing in smart homes.