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Cloud data security is one of the critical factors of business conviction. Increasing internet bugs and intrusion necessitate efficient security mechanism. The work presented here proposed a two layer mechanism for providing efficient and computationally light security procedure. At the first layer public key cryptography has been used, whereas second layer is totally based on steganography. RSA method is used for key exchange and AES for encryption and decryption to make the method computationally efficient. Since the second layer shuffles the encrypted messages in stegad images so security is much higher than individual approach and other existing approaches. The cloud is computationally very efficient and these processes computationally very light so availability of data is unaffected through it.