MP4 VIDEO STEGANOGRAPHY USING LEAST SIGNIFICANT BIT (LSB) SUBSTITUTION AND ADVANCED ENCRYPTION STANDARD (AES)

摘要

Data transmission over the internet is vulnerable for attacked, therefore additional data security is required. Steganography is one of security protocol which used for protect the data. This research applied steganography using MP4 video as the host (cover media) and JPEG image as the embedded data. An AES-128 bit encryption was applied to the image before it embedded into the video. Encrypted image then stored bit-per-bit into an array. Those bits array then were embedded into the video by modifying LSB of the bytes of video. The image was embedded in the first still-encoded sample of the video. Sample was found by using atoms of MP4 container, those were stco/co64, stsc, stsz, stts dan mdat. Those atoms stored metadata of the video, thus could be used for mapping position of all the samples. The LSB substitution process did not touched the color spaces of the video, thus video quality can not measured using Peak Signal-to-Noise Ratio (PSNR) value. Video quality measured by a software called Qualify and the stego-video is scored 80 for its quality. That value indicated stego-video had an excellent quality. Stego-video could played well at all the common video player on any devices and there was no quality degradations or any changed as seen by human eyes. This research could contribute on increased the security of an image data when stored at the cloud storage or being transmitted over a network.