The intellectual growth of computer communication lead to drastic improvement in wireless technology and shrunken the world into palms of the user which paved the path for the security attack issues. The development of the security system became the ultimate. Popular technique widely used in present scenario that provides a better security to secret information is image encryption. Multiple encryption technique has been adopted in this study. The secret image is block shuffled and then chaotic maps such as baker map, skew tent map and Arnold cat map are used to encrypt the image. Further the image is encrypted using Cipher Block Chaining (CBC) to contribute the final encrypted image. Metrics such as horizontal, vertical, diagonal correlation, Number of Changing Pixel Rate (NPCR) and entropy were calculated for various Digital Imaging and Communication in Medicine (DICOM) test images and the performance of the algorithm was analyzed.

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In the Digitalized world, the problem exists in transmitting and concealing highly secured and important information. This results in developing better technique/algorithm for the secure and safe transmission of information with data hiding. Here comes our study in Audio Steganography. With the existing scenario we say that Differential Pulse Code Modulation (DPCM) is better than Pulse Code Modulation (PCM). If Steganography is implemented in the audio signal, the above result is contrary. We focus on the audio steganography for analyzing the behavior for different modulation schemes. The result is controversial (i.e.) PCM is better option for transmitting an encoded audio signal with text information. This result has not been proved yet in terms of coding. The coding is developed in MA TLAB. In the algorithm, using the scattering method, the encoded text is embedded into digitized audio signal. Here comes the case study of each method of modulation, ultimately proving that PCM is better method compared to Differential PCM (DPCM).

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