Abstract: The cloud computing has been developed as the next generation architecture in IT industry. In addition to traditional solutions where IT services are under control of physical/ logical / personal controls. Cloud computing moves to the application software as well as databases to the large data centres, where large amount of data and services manage properly. These maybe not fully trusted. So, that causes to introducing new challenges in cloud era. In this paper we are focusing on Cloud Security, Data Integrity, authentication, authorization. Here basically storage correctness, fast localization, dynamic data support, dependability are take into consideration.

Keywords: Cloud Computing, Cloud Service Provider, Cloud Security Services, Data Integrity, Data Recovery, Third Party Auditor.