Multi-receiver Certificateless Searchable Public Key Encryption Scheme for IoMT

The Internet of Medical Things (IoMT) is widely used in the medical industry. It uses various wearable medical devices and cloud servers to transfer data at high speeds over the network, significantly improving diagnostic efficiency. Searchable encryption has been proposed to keep sensitive information confidential. It helps to protect private data by encrypting it and allows for searching of encrypted data. Recently, many searchable public key encryption (SPE) schemes have been designed to balance security and efficiency. However, most existing SPE schemes have shortcomings, such as certificate management problem, key escrow problem, or the inability to realize multi-receiver data sharing flexibly. To solve the above problems, we designed a multi-receiver certificateless searchable public key encryption (mCLSPE) scheme based on SPE and proxy re-encryption for IoMT. In the random oracle model, the scheme is proved to be secure. The performance analysis shows that it has an ideal comprehensive performance.