SECURED ATTRIBUTE BASED DATA SHARING Students of BE Computer (original) (raw)

With the recent embracement and radiation of the data sharing standards in distributed systems, there have been increasing demands and concerns for distributed data assurance. One of the most challenging issues in data sharing systems is the enforcement of access policies and the support of policies updates. Ciphertext policy attribute-based encryption (CP-ABE) is becoming a promising cryptographic solution to this issue. By using this technique encrypted data can be kept confidential even if the storage server is untrusted; moreover, this method is secured against collusion attacks. It enables data owners to define their own access policies over user attributes and enforce the policies on the data which to be distributed. But it has problem known as a key escrow problem. The key generation center could decrypt any messages addressed to specific users by generating their private keys. In addition, applying CP-ABE in the data sharing system introduces another challenge with regard to the user revocation since the access policies are defined only among the attribute set. Therefore here we come up with secured attribute based data sharing CP-ABE scheme by applying the characteristic of the system architecture. Itresults in following achievements: The key escrow problem could be solved by Escrow-Free Key Issuing Protocol and revocation per each attribute could be done by proxy encryption which takes advantage of the selective attribute group key distribution on top of the ABE.