Now a day, Security is becoming a main concern to maintain confidentiality and integrity of the data. For this purpose, cryptography techniques are used. Cryptography is used to encrypt the data into non readable format and decrypt it again into readable format when needed using specific key. Also for business perspective, cloud computing is very useful. Cloud Computing has become one of the most talked about technologies in recent times and has got lots of attention from media as well as analysts because of the opportunities it is offering. It has different meaning to different uses according to their need. Cloud computing provides an illusion to the customers of using infinite computing resources that are available from anywhere, any time on demand. Cloud computing provide secure data transmission. Security of data becomes a large concern to insure various attribute like integrity, confidentiality, authentication etc., Asymmetric cryptography techniques like DSA,RSA, Elgammal and ECC plays a major roles in protecting the data in those application which are running in a network environment. In this paper providing comparative analysis on various security algorithm which are already available.