This book describes the implementation of algorithms for providing security and privacy in cloud-based services. The goal is to avoid the various attacks and to identify a better route to transfer the data securely in the cloud environment. The main objective is to design a proactive approach to ensure valid client authentication by the cloud provider. A Two Factor Authentication (TFA) scheme is proposed based on the One Time Password (OTP) which is generated and sent to authorized users through the mail. Accessing the data in cloud environment is done by the client through authentication,...