Key-Aggregate Searchable Cipher Technique for Multi Data Sharing Through Cloud System

Data Sharing is bene�cial activity in cloud memory. In this article, we show how to protectively, effectively, and scalable share data with others in cloud database. We explain new public-key cryptography which generate static-size encryption such that efficient allocation of decryption rights for any set of cipher texts is possible. The innovation is that one can cumulative any set of secret keys and make them as compact as a single key, but encompassing the power of all the keys being cumulative. In other words, the secret key holder can release a constant-size cumulative key for scalable choices of cipher text set in cloud database, but the other encrypted �les outside the set remain con�dential. This compact cumulative key can be conveniently sent to others or be stored in a smart card with very limited secure database. We provide formal security investigation of our schemes in the standard model. We also describe other application of our schemes. In particular, our schemes give the �rst public-key patient-controlled encryption for scalable hierarchy, which was yet to be known.