Day by day it is becoming necessary and feasible to use cloud storage due to its flexible and secure services. As more number of users are adopting cloud data services different types of threats are troubling them. In such scenario available Cloud Service Provider's security services may seem insufficient to keep user's data safe. User level security mechanism helps to improve security and user's trust in adopting the cloud data services. In our system we have implemented online data encryption mechanism. It is used at user level in which data to be uploaded to cloud storage is encrypted at the time of uploading. Online data encryption helps to fasten the process and saves user's time. To provide better data access control we have used a strong data security technique in which user's data identification credential and salt is used. Data identification credential, partial element of cipher key, is outsourced to cloud for further use in data decryption process. Decryption process is performed at the user level with the help of salt and one time password. In this system user is kept free from key storage and management task as well as it incorporates advanced and more secured technology of containers to store data in cloud. This paper incorporates the detailed analysis of results obtained.