Data Security for Multi Users in Cloud by Using Cryptography Technique

The major aims of this technique a secure multi-owner knowledge sharing theme. It implies that any user within the cluster will firmly share knowledge with others by the world organization trust worthy cloud. This theme is ready to support dynamic teams. Efficiently, specifically, new granted users will directly rewrite knowledge files uploaded before their participation whereas not contacting with knowledge owners. User revocation square measure just achieved through a very distinctive revocation list whereas not modification the key. Keys of the remaining users the size and computation overhead of cryptography square measure constant and freelance with the amount of revoked users. We’ve a bent to gift a secure and privacy-preserving access management to users that guarantee any member throughout a cluster to anonymously utilize the cloud resource. Moreover, the $64000 identities of information owners square measure disclosed by the cluster manager once disputes occur. We offer rigorous security analysis, and perform intensive simulations to demonstrate the potency of our theme in terms of storage and computation overhead. Cloud computing provides a cheap associated economical resolution for sharing cluster resource among cloud users sharing knowledge associate degree passing throughout a} terribly multi-owner manner whereas protecting knowledge Associate in Nursing identity privacy from an world organization responsible cloud continues to be a harissue, because of the frequent modification of the membership