Complex Encryption Methodology Based On Two Level Encryption Technique

In this paper a complex encryption methodology has been employed to perform a high level data security. Here a two level encryption technique has been described. In first level a pattern matching array has been developed in such a way such that all possible combination of any 4 bits sequences is present there. The positional value of the secret message has been identified from this pattern matching array and in second level the identified positional value has been embedded into the LSB of the cover file. This technique is independent of the size of the text message and message retrieved in the receiving end is totally lossless .The quality of the proposed method is evaluated by using two quality measure, Means square error (MSE) and Signal to Noise Ratio (SNR).When compared with other methods, the proposed method is shown to be superior on addressing major requirements, imperceptibility, undetectability and capacity major which are main criteria of any steganography algorithm