Secure Keyword Search over Encrypted Cloud Data Using Blockchain in Digital Document Sharing

Due to the drawbacks of the many-to-many search model for accessing digital records in institutional settings like offices, hospitals, and government agencies, the paper proposes a searchable attribute-based cryptosystem scheme that uses the concept of blockchain technology that provides for authentication and self-validation, and can be applied to secure digital document sharing systems. By keeping the ciphertext document on the cloud, the index on the blockchain, and the smart contract handling the searching of documents, it helps lighten the cloud's computing load. Data integrity and privacy are also guaranteed by this technique, as is the veracity of the findings supplied by the cloud server. The strategy may be used to get rid of redundant information and save space in cloud storage. The concealment of access policy also ensures the privacy of its users. The security study demonstrates that the suggested system protects the privacy of user information and the secrecy of digital document data against adaptively chosen-keyword attacks. Experiments and analysis of performance show that the suggested technique improves upon previous approaches in terms of securing indexes, token generation, efficiency of searching, and verification of results; as a consequence, it is better suited for search situations where a many-to-many search approach is required. It allows for secure and efficient collaboration on electronic documents between departments and external parties.