مرکز منطقه ای اطلاع رسانی علوم و فناوری Journal of Information Systems and Telecommunication (JIST) 2322-1437 14 53 2026 6 29 KSDB: Improving cloud database security by using searchable encrypted data KSDB: Improving cloud database security by using searchable encrypted data 50 58 en Davud Mohammadpur University of Zanjan Mahmood Khoeini University of Zanjan 2025 7 19 <p class="Sammary">Data encryption is a highly effective means of ensuring data security. It transforms readable data into a ciphertext format using cryptographic algorithms and keys. However, the challenge arises when performing query operations on encrypted data due to the alteration of the data structure. This article introduces an improved method that facilitates encryption and query operations on encrypted cloud data without requiring decryption. By leveraging reverse indexing, information mapping, and secret sharing across multiple servers, the proposed method KSDB guarantees data security and prevents data disclosure during both the encryption and query execution processes. The KSDB is an application-level encryption technique that the encrypted data is stored in the cloud storage. While existing methods primarily concentrate on numerical data, this study places emphasis on maintaining the confidentiality of string data, enabling search operations on partial strings without decryption. The results and evaluations demonstrate a significant reduction in memory consumption achieved by the proposed method. In KSDB all implementations have been migrated to a dedicated private server. This secure and reliable entity is responsible for managing critical data, including encryption keys. This strategic decision effectively resolves security issues present in pervious methods and facilitates encryption and decryption processes. Furthermore, it not only addresses concerns regarding information leakage but also enhances data confidentiality.</p> http://jist.ir/ar/Article/Download/50894