关键词: 信息隐藏, 批量隐写, 图像缩放, 安全性

Abstract: Based on digital image scaling, a secure steganographic model for batch steganography was proposed, which conformed to the absolute safety definition. After being divided into many blocks, the secret information was deduced by using image scaling algorithm, rather than directly embedded in the carrier images. Firstly, a batch of carrier images were selected and zoomed to a specified magnification through a specific algorithm, then the relevance of the pixel information between secret image blocks and new images could be found out, finally new images were reduced to size of the original images for transmission. Since the scheme did not directly modify the image pixels, the original images were not required for extracting secret images and the security of the stegosystem had been improved. The experimental results and analysis show that the proposed algorithm is effective and it can be applied to image concealed communication.

Key words: information hiding, batch steganography, image scaling, security