Data Security In Decentralized Cloud Computing

  • C.Anuradha,R.Kavitha, T.Shiva sai Krishna,V.Kowshik


The cloud computing, users  can  achieve  an  effective  and  economical  approach  for  data  sharing  among  group  members  in  the  cloud  with  the  characters  of  low  maintenance  and  little  management  costMeanwhile, we must provide  security  guarantees  for  the  sharing  data  files  since  they  are  outsourcedUnfortunately, because of the frequent change of the membership, sharing datawhile providing  privacy-preserving  is  still  a  challenging  issue,  especially  for  an  untrusted cloud  due to the collusion attackMoreover, for existing schemes, the security of key distribution  is  based  on  the  secure  communication  channel,  however,  to  have  such  channel is a strong assumption and is difficult for practicewe propose a secure data sharing scheme fordynamic membersFirstly, we propose a secure way  for  key  distribution  without  any  secure  communication  channels,  and  the  users  can securely  obtain  their  private  keys  from  group  managerSecondly, our scheme can achieve fine-grained access control, any user in the group can use the source in the cloud and private key is valid

only once and cannot access the file again after they are revoked. Thirdly,  we  can  protect  the  scheme  from  collusion  attack,  which  means  that  revoked  users  cannot get the original data file even if they conspire with the untrusted cloudIn our approach, by leveraging polynomial function, we can achieve a secure user revocation schemeFinally, our scheme can achieve fine efficiency, which means previous users need not to update their private keys for the situation either a new user view in the group.