A Privacy Preserving and Efficient Multi Authority – CP-ABE Scheme for Secure Cloud Communication

Keywords: MA-CP-ABE, hidden access policy, constant length ciphertext, corrupt resistant, key escrow free


In the cloud computing environment, Multi authority Ciphertext Policy-Attribute Based Encryption (CP-ABE) schemes are used as a key escrow free solution to securely and efficiently share data over cloud. However, the length of ciphertext in existing Multi Authority-CP-ABE schemes increases with the number of attributes in the access policy. Moreover, these schemes do not protect against dishonest attribute authorities. In this paper, a constant length ciphertext Multi Authority-CP-ABE scheme is proposed that reduces the communication overhead over the network. The scheme also prevents dishonest authority from compromising the system. Apart from this, for enhanced privacy of receivers, the access policy is communicated in hidden form. Thus, the presented scheme provides an efficient corrupt resistant, key escrow free Multi Authority-CP-ABE scheme by generating constant length ciphertext and hidden access structure. Results demonstrate the enhanced security and reduced cost of encryption and decryption by 8% and 48% respectively as compared to other existing works.


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Author Biographies

Shardha Porwal, Department of Computer Science Engineering & Information Technology, Jaypee Institute of Information Technology, Noida, India

Shardha Porwal is Assistant Professor in department of computer science engineering and information technology in Jaypee Institute of Information Technology, Noida. Her research interest includes Cryptography and Network Security, Data structure and algorithm. She has published several papers in international conferences and journals. She received her M.Tech. degree from Maulana Azad National Institute of Technology, Bhopal, India. She has 10+ years of teaching experience.

Sangeeta Mittal, Department of Computer Science Engineering & Information Technology, Jaypee Institute of Information Technology, Noida, India

Sangeeta Mittal is Associate Professor in Jaypee Institute of Information Technology, Noida. Her areas of research interest include Software Defined Networks, Computer Networks, Network Security, Cryptography, Sensor Based Smart Environments and Wireless Sensor Networks. She has published several papers in international conferences and journals of repute. She earned her PhD from Jaypee Institute of Information Technology, M.E. in Computer Engineering from Punjab University Chandigarh India and BE from Maharishi Dayanand University, Rohtak, India. She has 16+ years of experience in teaching UG and PG computer science courses. She is a member of ACM and life member of CSI.


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