In cloud storage, efficiently and securely searching sensitive data is challenging. Searchable encryption ensures secure storage without compromising data confidentiality and usability. Public-key encryption with keyword search (PEKS) is widely studied but often vulnerable to inside keyword guessing attacks. Mitigating this has been historically inefficient. To address this, we propose Dual-server Public-key Authenticated Encryption with Keyword Search (DPAEKS), defending against inside keyword guessing by utilizing two non-cooperating servers with authentication. Our scheme, without bilinear pairings, is highly efficient and secure, demonstrated by real-world dataset experiments. This makes it suitable for practical applications, providing a robust solution to the challenges in cloud storage security.+

Keywords: Cloud storage, public-key encryption with keyword search, dual-server, authorization, inside keyword guessing attacks.