A Survey on CryptoSteganography: A Multilayer Security Data Hiding

Information Security [ Computer Science Engineering]

Now a days there is a challenges faced by Data or Information Security Field. We have to make this data free from harm during transmission. The primary aim is to make an application which enables sensible information by covering securely in statistically undetectable communication channel. The two important concepts of securely transmitting information or data over a medium like internet are Steganography and Cryptography. Steganography is the art of secure communication which aims to hide the secret or sensitive information into a cover medium while observing the least possible statistical detectability. Cryptography is a scheme which decodes secret messages into several encrypted forms and distributes them. These both are used to assure security. But none of them can simply satisfy the basic needs of security i.e. the properties such as robustness, undetectability and capacity etc. A new technique based on the merging of both Cryptography and Steganography which can be named as “Cryptosteganography” is necessary which overcomes each other’s limitations and make hard for the intruders to attack or steal sensitive information is being proposed. To provide again more security to this new technology of Cryptosteganography a newest methodology is added to it which can be named as “Multilayer Steganography”. This new technique makes use of two cover files to strongly hiding of the Crypto-Stego file for providing very strong security in transmission of important data. The problem of the size of file during transmission is also resolved by “Multilayer Cryptosteganography Compression”. Application of this extends the horizon of data and file embedding and secrecy of data. Thus the scope is better than the existing Cryptography and Steganography systems which only the operations of data hiding and message embedding in the file.

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