Secure multiowner data sharing in the cloud

Cloud computing provides a cheap and economical resolution for sharing cluster resource among cloud users sharing knowledge during a multi-owner manner whereas protective knowledge and identity privacy from an untrusted cloud continues to be a difficult issue, as a result of the frequent modification of the membership. This project proposes a secure knowledge sharing, for dynamic teams within the cloud. It implies that any user within the cluster will firmly share knowledge with others by the untrusted cloud. With efficiency, specifically, new granted users will directly decipher knowledge files uploaded before their participation while not contacting with knowledge house owners. User revocation will be simply achieved through a completely unique revocation list while not changing the keys of the remaining users. The scale and computation overhead of secret writing are constant and freelance with the quantity of revoked users. This projected theme satisfies the required security necessities and guarantees potency furthermore with real time implementation in Google app engine.