Checking Only When It Is Necessary: Enabling Integrity Auditing Based on the Keyword With Sensitive Information Privacy for Encrypted Cloud Data

The public cloud data integrity auditing technique is used to check the of through Third Party Auditor (TPA). In order make it more practical, we propose a new paradigm called based on keyword with sensitive information privacy for encrypted data. This designed one most common scenario, that is, user concerns portion files contain his/her interested keywords. our proposed scheme, TPA who only provided keyword, can audit all user’s keyword. Meanwhile, cannot deduce about which and how many this These salient features are realized by leveraging newly Relation Authentication Label (RAL). RAL not authenticate relation queried but also be generate proof without exposure. We give concrete security analysis showing scheme satisfies correctness, soundness privacy. conduct detailed experiments show efficiency scheme.