Efficient Ciphertext-Policy ABE with constant ciphertext length
Phuong Viet Xuan Tran, Thuc Nguyen Dinh, Atsuko Miyaji · Computing and Convergence Technology (ICCCT), 2012 7th International Conference on · 2012
Following the development of promising result of Ciphertext-Policy Attribute-based encryption (CP-ABE), in which every secret key is associated with a set of attributes, and every ciphertext is associated with an access structure on attributes. Decryption is enabled if and only if the user's attribute set satisfies the ciphertext access structure. Apart from the proposed properties of CP-ABE, we propose a new construction of CP-ABE that significantly reduces the ciphertext to a very short constant size for any number of AND gate access policy on any number of attributes. Our scheme is proven CPA and CCA-secure under the Decisional Diffie Hellman assumption. Moreover we present the construction our CCA scheme with public key encryption non-interactive opening(PKENO) scheme and using CHK technique to achieve CCA secure.