Abstract :
Cloud computing is now seen as the next generation architecture of IT enterprise. The cloud computing
hypothesis, the advantages and its potential for diminishing costs and reducing the time for a deal that favours
towards the security issues. Cloud Computing is also an aggregation of IT services that is offered to the customers
based on leasing. Though a large number of security issues are addressed, still some are not addressed and several
algorithms are proposed for security issues. Clouds are extraordinarily complex systems. They can be condensed to
plain primitives, that ca be replicated thousands of times, and universal functional units. The intricacy of cloud
computing produce many issues connected to security as well as all the aspects of Cloud computing. One of the key
issues is data security. Since Clouds characteristically have single security architecture but has numerous customers
with diverse demands. This paper presents a strong view on cloud computing technologies, vital features,
classifications, delivery models and different encryption mechanisms. A relative study made on numerous encryption
techniques are used for maintaining the discretion of data in the cloud. Finally, the most important data security
issues present in cloud computing are discussed.
Keyword :
Cloud Computing, Encryption Techniques, Classification, Data security, Authentication, Security in Cloud