A Keyword Based Searching and Sharing Scheme on the Encrypted Cloud Data

Security is one of the major concerns in the cloud server for users when local storage data is outsourced to the cloud. It gives rise to security concerns involving data confidentiality even after the deletion of data from cloud storage. Data must be encrypted before uploading to the public cloud to ensure data security and protection from unwanted and unauthorized parties so they cannot get access to private data. Sharing encrypted data with other users, specifically with a searching facility in the encrypted data, is challenging. Searching over encrypted data is essential to avoid downloading large data to the local storage and searching in the downloaded data. A cloud storage service can search over encrypted data on behalf of the data users using searchable encryption without knowing the underlying plain texts. While many searchable encryption schemes show provable security, they usually expose some query information, making them less practical. This paper presents a noble scheme that enables sharing and keyword-based searching on encrypted data stored in the cloud storage. It helps users download specific data by searching keywords and avoid downloading all the data from the storage.