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Security has become a significant concern with the increased popularity ofcloud storage services. It comes with the vulnerability of being accessed bythird parties. Security is one of the major hurdles in the cloud server for theuser when the user data that reside in local storage is outsourced to thecloud. It has given rise to security concerns involved in data confidentialityeven after the deletion of data from cloud storage. Though, it raises a seriousproblem when the encrypted data needs to be shared with more people than thedata owner initially designated. However, searching on encrypted data is afundamental issue in cloud storage. The method of searching over encrypted datarepresents a significant challenge in the cloud.  Searchable encryption allows a cloud server to conduct a search overencrypted data on behalf of the data users without learning the underlyingplaintexts. While many academic SE schemes show provable security, they usuallyexpose some query information, making them less practical, weak in usability,and challenging to deploy. Also, sharing encrypted data with other authorizedusers must provide each document's secret key. However, this way has manylimitations due to the difficulty of key management and distribution.  We have designed the system using the existing cryptographic approaches,ensuring the search on encrypted data over the cloud. The primary focus of ourproposed model is to ensure user privacy and security through a lesscomputationally intensive, user-friendly system with a trusted third partyentity. To demonstrate our proposed model, we have implemented a webapplication called CryptoSearch as an overlay system on top of a well-knowncloud storage domain. It exhibits secure search on encrypted data with nocompromise to the user-friendliness and the scheme's functional performance inreal-world applications.

A Practical Framework for Storing and Searching Encrypted Data on Cloud Storage