Secure and Efficient Certificateless Searchable Authenticated Encryption Scheme Without Random Oracle for Industrial Internet of Things

Today, the development of the Industrial Internet of Things (IIoT) has led to a rapid increase in industrial data. More and more industrial enterprises outsource local data to cloud service providers. To ensure the security of user data, encryption technology is necessary. Certificateless searchable authenticated encryption (CLSAE) can solve the problem of ciphertext retrieval for the IIoT. The security of most of the existing CLSAE schemes is proved in the random oracle model, but these schemes may have security risks in real application scenarios. We provide a new CLSAE scheme, which can resist both inside and outside keyword guessing attacks, and its security is proved in the standard model. We compare the scheme proposed in this article with other existing CLSAE schemes. Not using expensive operations, the new scheme is more efficient and more in line with the needs of the IIoT.