Now a day’s cloud computing is employed in several areas like business, military schools etc. to storing immense quantity of knowledge. We are able to retrieve knowledge from cloud for the asking of user. To store knowledge on cloud we've got to face several problems. To provide the answer to those problems there are n variety of how .Cryptography and steganography techniques are additional fashionable currently a day’s for knowledge security. Use of one formula isn't effective for prime level security to knowledge in cloud computing. During this paper we've got introduced new security mechanism mistreatment original key cryptography formula and steganography .In this projected system AES, blowfish, RC6 and brassiere algorithms are wont to give block wise security to knowledge. All formula key size is 128 bit. LSB steganography technique is introduced for key info security. Key info contains that a part of file is encrypted mistreatment by that formula and key. File is spliced into eight components. Every and each a part of file is encrypted mistreatment totally different formula. All components of file are encrypted at the same time with the assistance of multithreading technique. Encryption Keys are inserted into cowl image mistreatment LSB technique. Stego image is send to valid receiver mistreatment email .For file cryptography purpose reverse method of encoding is applied.