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Secure Data Transmission Using Steganography and Twisted Exchange Algorithm

Privacy has always a growing impact on the modern applications and the growth in term of technology. The demand for the highest privacy must be guaranteed in the field of technical, commercial and legal regulations whenever sensitive information is stored, processed, or communicated in any form. Thus new technologies are also created new ways to gather private information. In this system, to transmit data securely and to improve robustness, imperceptibility and payload capacity, combination of steganography and cryptography techniques are used. The referable values of secret image is embedded in the video file with the use of Arnold scrambling technique, discrete wavelet transformation and least significant bit. The secret key generated referable values of image is embedded behind the audio file. Before embedding of secret key, it is encrypted by a new proposed encryption algorithm, Twisted Exchange algorithm. Therefore, in this paper, for the security strength of proposed algorithm, it is analyzed whether its generated key stream is random, unpredictable and consistent or not by using National Institute of Standards and Technology (NIST) statistical test tool and compare the results with other standard pseudorandom number generators.