Abstract: Cloud computing comes into focus only when you think about what IT always needs: a way to increase capacity or add capabilities on the fly without investing in new infrastructure, training new personnel or licensing new software. Cloud computing encompasses any subscription-based or pay-per-use service that in real time over the Internet, extends IT’s existing capabilities. Cloud computing is an updated version of utility computing: basically virtual servers available over the internet or anything you consume outside the firewall is “in the cloud” including conventional outsourcing. There are nine primary reasons why mid-sized companies (100-500 employees) are adopting Cloud services such as defer and avoid expansion of data center facilities, strengthen Business continuity, prepare for disaster recovery, earn a high return on investment, improve security compliance, defer server purchases and upgrades, shift from capital to operating budget, strive to go green, decrease IT staff. Cloud computing has several major issues and concerns such as data security, trust, regulations and performance issues. Security is one of the most critical aspects in cloud computing. There are various risks associated with security but one of the major issues is the security during data transmission and data storage. Before outsourcing the data into cloud servers, data’s are encrypted using Encryption algorithms by the users for security purpose. There are various Encryption algorithms are used to encrypt the data. This study concentrated on various encryption techniques are discussed for providing solutions to cloud security.