A Critical Analysis on Encryption Techniques used for Data Security in Cloud Computing and IOT (Internet of Things) based Smart cloud storage System: A Survey

Cloud computing is an era of computing to increase the capacity of computing power dynamically without more investing in new infrastructure. It is very flexible in nature that helps to quickly access the resources efficiently from the third party service provider to expand the business with low capitalization cost. A cloud storage system stores large amount of data in its server storage system. Since the data is stored for a long term over the internet in cloud storage system it does not provide the data confidentiality and make the hackers to steal the data from storage system and even when data transition in cloud environment, With the arrival of 4G technologies and the development of 5G technologies, the mobile and wireless devices have changed people's life. A large numbers of mobile applications produce massive sensitive data such as health, space, defense and location information in IOT based cloud computing system. Data Security in cloud is main issues of this technology. There are many methods to overcome this issue but it can't give 100% surety about security. Data encryption is one important method to improve security of data in cloud environment. So we have briefly discusses some of the existing cryptographic algorithm approaches that help us to improve the data security in cloud environment. Before outsourcing the data from client to server, it is encrypted by encryption algorithms at client side then it will store in data server in encrypted form for security purpose. There are various encryption algorithms used to encrypt data in cloud storage system.