Abstract: Cloud computing has become trend in IT industry for storing, retrieving and maintaining the data over the internet. The advantage of cloud computing is easy accessing of data, reduced hardware, low maintenance and installation cost. But it is tough to preserve the data security and privacy. Thus the security has become the major issue in cloud computing because malicious user attacks the data easily by using various hacking techniques hence in this paper we discussed about various encryption algorithm and describe how encryption algorithms protects the data from intruder.

Keywords: Cloud computing, IT industry, encryption algorithms, data security and privacy.