One of the main challenges in public cloud storage is accessing the data. There are various techniques to provide flexible, fine-grained and secure control access and one among them is Cipher-text policy attribute-based encryption (CP-ABE). In CP-ABE scheme, single attribute authority executes legitimacy verification and secret key distribution and this results in a single point bottleneck approach. When this scheme is applied on a large scale cloud then the user must wait for a longer period to obtain the secret key and performance of the system becomes low. To overcome single point bottle neck problem, a heterogenous framework is used which employs multiple attribute authorities. This framework shares the load of user legitimacy verification. In the new scheme, central authority acts as the administrator of the system and shares the secret key whereas the multiple attribute authority manages the whole attribute set independently. Proposed scheme enhances more security and improves the efficiency of the system.