Application of the modified EzStego algorithm for hiding secret messages in the animated GIF images

Abstract

Animated GIF images consist of a number of frames that displayed in succession as a video. Capacity of hiding messages (or payload) in an animated GIF file is much greater than in a single GIF image. A modified EzStego steganography algorithm has been proposed for GIF images. The modified EzStego is a improved version of the original EzStego so that bits of the message can be embedded randomly in the image. The modified EzStego is based on chaos theory. In this paper we applied the modified EzStego algorithm for hiding the secret messages in the animated GIF images. Bits of the message are embedded randomly in each frame. Frames also can be selected randomly for increasing security. In order to more secure, the message is encrypted before embedding. The bits of the message is encrypted with random bit which is generated by a chaos map. Based on experiments, the modified EzStego algorithm can be applied to the animated GIF images with the minimal visual distortions.