Design and Analysis of Schemes for Privacy Preserving Cloud Storage Services

Abstract

Public cloud storage services have become the leading choice for individuals and newlineorganizations to store their data, as the service provides the benefits of availability newlineand reliability together at a reduced cost. While storing data in public cloud storage newlineserver, preserving data security and privacy have become a prime concern. newlineFor providing data security on public cloud storage it is required to preserve the newlineconfidentiality of data and to enforce the data access policies. Before uploading newlinethe data to public cloud storage, data can be encrypted and assured that only authorized newlineusers access the data with a valid decryption key. Attribute Based Encryption (ABE) is a well-known cryptographic primitive newlinethat provides both the confidentiality and fine-grained access control together. In newlineABE, each data user is identified with a set of attribute values. Each data file has newlinean access policy defined by its owner in terms of the attributes. A user can decrypt newlinethe document, only if the threshold number of attributes are matched between newlinethe access policy and user s attribute list. newline