• Prof.Rupali Adhau
• Prof. Sharmila Chopade
• Prof.Chhaya Gochade

In public cloud storage system protecting the data and controlling the data access is a challenging issue. Cipher text Policy Attribute-Based Encryption (CP-ABE) has been adopted as a promising technique to provide flexible, fine-grained and secure data access control for cloud storage with honest-but-curious cloud servers. However numerous works have been proposed using CP-ABE scheme, in which the single attribute authority must execute the time-consuming user legitimacy verification and secret key distribution and hence it results in a single-point performance bottleneck when a CP-ABE scheme is adopted in a large-scale cloud storage system. Clients may be stuck in the waiting line for a long stretch to get their mystery keys, which results in low-efficiency of the framework. The proposed system a secure and verifiable access control scheme based on the NTRU cryptosystem for big data storage in clouds. In this system first proposed a new NTRU decryption algorithm to overcome the decryption failures of the original NTRU, and then detail our scheme and analyze its correctness, security strengths, and computational efficiency. Our scheme allows the cloud server to efficiently update the cipher text when a new access policy is specified by the data owner, who is also able to validate the update to counter against cheating behaviors of the cloud.

Big Data Storage,Access Control,the NTRU Cryptosystem, Secret Sharing,Access Policy Update,Cloud Computing.

"A Secure and Verifiable Access Control Scheme for Big Data Storage in Clouds.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.231-235, December-2018, Available :http://www.jetir.org/papers/JETIR1812535.pdf

"A Secure and Verifiable Access Control Scheme for Big Data Storage in Clouds.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp231-235, December-2018, Available at : http://www.jetir.org/papers/JETIR1812535.pdf