Motion-based less significant frame for improving LSB-based video steganography

Steganography is a technique to hide secret messages in certain media, such as images, audio, and video, so that are not visible to the human eye. In this study, we use the LSB (least significant bit) method to hide various documents into the video. The use of video as cover media has advantages, especially the amount of storage capacity and better security level. A video file consists of some frames or images. Commonly, other researchers are inserting a message in some frames starting from the first frame, or in a particular order. In this study, we proposed a method for selecting the location of the insertion of a message on some insignificant frames. We called it Less Significant Frame (LSF) method. Frame selection is based on the movement of each frame using optical flow features. Tests have been conducted to prove the quality of the stego-video using the fidelity aspect that was measured using PSNR value. The test results showed that in experiments with methods LSB and LSF, the quality of video that has been inserted proved to be better than the experiment without LSF. The average value of PSNR on trial with the LSB and LSF method amounted to 44.417638 dB, whereas in trials without LSF amounting to 39.513614 dB.