Authorized Keyword Search over Outsourced Encrypted Data in Cloud Environment

For better data availability and accessibility while ensuring secrecy, end-users often tend to outsource their the cloud servers in an encrypted form. However, this brings a major challenge perform search for some keywords over content without disclosing any information unintended entities. This paper proposes novel expressive authorized keyword scheme relying on concept of ciphertext-policy attribute-based encryption. The originality proposed is multifold. First, it supports generic convenient multi-owner multi-user scenario, where are outsourced by several owners searchable multiple users. Second, formal security analysis proves that semantically secure against chosen outsiders guessing attacks. Third, interactive protocol introduced which avoids need secure-channels between users service provider. Fourth, due bilinear-map accumulator, system can efficiently revoke and/or attributes, authenticate them prior launching expensive operations. Fifth, conjunctive provided thus enabling simultaneously, with minimal cost. Sixth, performance shows outperforms closely-related works.