Multi Cloud Storage of Data with Cost Efficiency Using Data Centric Security

摘要: Cloud computing provides a flexible and convenient way for data sharing, which brings various benefits both the society individuals. But there exists natural resistance users to directly outsource shared cloud server since often contain valuable information. Thus, it is necessary place cryptographically enhanced access control on data. Identity-based encryption promising primitive build practical sharing system. However, not static. That is, when some user’s authorization expired, should be mechanism that can remove him/her from Consequently, revoked user cannot previously subsequently To this end, we propose notion called revocable-storage identity-based (RS-IBE), provide forward/backward security of cipher text by introducing functionalities revocation update simultaneously. Furthermore, present concrete construction RS-IBE, prove its in defined model.