Video steganography: a comprehensive review

Steganography is the art and science of secret communication, concealing the very existence of a communication. Modern cover types can take many forms such as text documents, audio tracks, digital images, and video streams. Extensive research has been done on image steganography in the previous decade due to their popularity on the internet. Nowadays, video files are drawing much more attention. They are transmitted more and more frequent on internet websites such as Facebook and YouTube imposing a larger practical significance on video steganography. Information hiding in video has a variety of techniques, each of which has its strengths and weaknesses. This paper intends to provide an up-to-date comprehensive review on the various video steganographic methods found in the literature in the last 5 years. Furthermore, since security and robustness are very important issues in designing a good steganographic algorithm, some relevant attacks and steganalysis techniques are also surveyed. The paper concludes with recommendations and good practices drawn from the reviewed techniques.