Implementation of re-encryption based security mechanism to authenticate shared access in cloud computing

Cloud computing provides facilities of shared computer processing resources and data to computers and other device on demand. System environment developed by using three key entities trusted third party, data owner and user. The concept of shared authority based privacy preserving authentication protocol i.e., SAPA used to develop system to perform shared access in multiple user. Security and privacy issue as well as shared access authority achieved by using access request matching mechanism e.g. authentication, user privacy, user can only access its own data fields. The multiple users want to share data so that purpose re-encryption is used to provide high security for user private data. Privacy preserving data access authority sharing is attractive for multi user collaborative cloud applications.