Reversible Video Steganography using Hybrid DWT- DCT with Secure Cryptographic Technique and GPU

Abstract

Objectives: To propose a system that allows hiding of a video as secret message under the cover medium for secured transfer. Methods/Statistical analysis: In early days most of the work is done to hide multimedia data such as text, images, audio by using Least Significant Bit (LSB) and Most Significant Bit (MSB) techniques. Use of LSB and MSB techniques for data hiding affects the quality of the cover medium also it allow to hide limited amount of data. Findings: Exchange of large amount of secret data is not possible when multimedia data is used as a secret message. So video steganography is used, which allows to hide large amount of secret data and to transfer it securely. Proposed system allows hiding video as secret message under the cover medium. This is used for hiding and transmitting significantly more amount of data securely as compared to that of the existing systems. In the proposed work, hybrid DWT-DCT is applied on each frame of both cover video stream and secret video stream. For embedding, SVD (Singular Value Decomposition) is applied on LL band of each frame. For reducing the execution time the proposed model is implemented using GPU (Graphics Processing Unit). From results of proposed system 2.09 MB video can be hidden under the 2.27MB video which shows quite high capacity for hiding than any other video steganographic existing system. Also the quality of video does not get affected even after embedding the secret video. Improvements: Further work can be done to enhance the image quality of retrieved secret video.