A STUDY ON SECURE CLOUD DATA SHARING SCHEMA USING DYNAMIC TECHNIQUES

Information sharing among clients of a cloud is greatly benefited due to cloud computing, low support and small cost of administration. Although security certification is required for sharing the out sourced information documents. Due to the continuous change in participation, sharing of information with protection safeguarding is difficult particularly for an untrusted cloud. Under the existing arrangements, the safe keeping of key transmission is totally done with the help of communication channel. In this project work weare proposing a safe and trustworthy information sharing plan for dynamic clients. We plan a path which is safe for the distribution of the keys without using a single communication channel, the group manager hands over the keys safely to the clients. The aim of our schema is to get control over fine-grained access, that means any of the users can use the cloud and the revoked users cannot use it after getting revoked. We can also safeguard the schema from collusion attack that means the users which are revoked cannot use the cloud once after getting revoked even if they indulge in conspiring with the untrusted cloud. In our approach we can accomplish a safe client repudiation plot by utilizing polynomial capacity. Our plan can fulfill fine adequacy, a fully protected revocation schema for the user can be attained. At last, this schema attain proficiency that means there is no need to update the old keys in the case when either a new user joins or an old user revokes