Abstract: Cloud computing is an internet based computing that provides shared computer processing resources and data to computers and other devices on demand. Data sharing has never been easier and less demanding to the advanced cloud computing, and the correct examination on the information gives a variety of advantages t both the society and people. Data sharing with an extensive number of participants must consider a few issues, includes efficiency, data integrity and privacy of data owner. Ring signature is a promising candidate to build an anonymous and authentic data sharing system. It allows a data owner to anonymously authenticate the data which can be stored into the cloud or analysis purpose. Identity-based (ID) ring signature is an alternative to traditional public key cryptography, based on infrastructures (PKI). In PKI have a cost consuming certificate verification which is becomes bottleneck for the solution to be scalable. So the ID based ring signature reduces the process of certificate verification.
Key words: authentication, data sharing, cloud computing, forward security