Security and privacy for a data transmission become a major concern due to rise of internet usage. Many developers are working continuously to make an internet safe environment, but the intruders are very smart to hack the information. For that, two entities communicating need to communicate in a way which is not susceptible to listen in or interception. So every organization uses many data encryption techniques to secure their communication. There are two security mechanisms called, Cryptography and Steganography are being applied. By merging these techniques, two level of information security is achieved. This paper discuss about the way of working Cryptography and Steganography and their different approaches.