The transmission of data from source to the destination will be the prime objective when data is transmitted over the cloud. The cloud must transfer this data securely so that unauthorized user fail to access the transmitted data. As cloud comes in contact with many users, security of data is always at stake. So, in the proposed paper, we study and provide the mechanism of handling such situations. The existing paper provides the mechanism of detecting the malicious nodes but does not provide any mechanism of blocking such nodes which perform malicious activities. In the proposed system, we not only work towards that aspect but suggest encryption of data using ransom key.