A Secure Key Aggregate Searchable Encryption with Multi Delegation in Cloud Data Sharing Service

As the amount of data generated in various distributed environments is rapidly increasing, cloud servers and computing technologies are attracting considerable attention. However, server has privacy issues, including personal information requires help a Trusted Third Party (TTP) for sharing. because value increases, owner who produces must become subject In this study, we use key aggregate searchable encryption (KASE) technology, which enables keyword search, to efficiently share without using TTP. The traditional KASE scheme approach only discusses delegation authority from another user. if delegated entity cannot perform time-critical tasks shared unavailable, delegate further rights given other users. Consequently, paper proposes new that multi-delegation TTP includes an authentication technique between user server. After that, informal formal analysis BAN logic AVISPA security evaluation, compare performance aspects with existing schemes.