Conventional covert image communication is assumed to transmit the message, in the securest way possible for a given payload, over lossless channels, and the associated steganographic schemes are generally vulnerable to active attacks, e.g., JPEG re-compression, scaling, as seen on social networks. Although considerable progress has been made on robust steganography against JPEG re-compression, there exist few steganographic schemes capable of resisting to scaling attacks due to the tricky inverse interpolations involved in algorithm design. To tackle this issue, a framework for robust image steganography resisting to scaling with general interpolations either in standard form with fixed interpolation block, or pre-filtering based anti-aliasing implementation with variable block, is proposed in this paper. And the task of robust steganography can be formulated as one of constrained integer programming aiming at perfectly recover the secret message from stego image while minimizing the difference between cover and stego images. By introducing a metric - the degree of pixel involvement (dPI) to identify the modifiable pixels in cover image, the optimization problem above could be effectively solved using branch and bound algorithm (B\&B). In addition, a customized distortion function for scaled stego images is adopted to further boost the security performance. Extensive experiments are carried out which demonstrate that the proposed scheme could not only outperform the prior art in terms of security by a clear margin, but also be applicable to resisting the scaling attacks with various interpolation techniques at arbitrary scaling factors (SFs).
翻译:常规隐蔽图像通信被假定为以最安全的方式传递信息,让特定有效载荷、无损通道和相关的摄像图谱系统能够以最安全的方式传递信息,而相关的图象图象图案通常很容易受到主动攻击,例如,如社交网络所见,JPEG再压缩、缩放等。虽然在针对JPEG再压缩的稳健透析法方面已经取得了相当大的进展,但是,由于算法设计涉及的微妙的反插图解,因此几乎没有什么能够抵抗攻击规模缩小攻击的图象图案。为了解决这一问题,一个强有力的图像图象学框架,以标准的形式抵制以一般内插图进行缩放,或者采用固定内插图块的标准形式,或者以预过滤基础反反反反射法实施(如在社交网络网络网络中),本文中提议了。而稳健的线谱学任务可以被写成一个限制的整形编程,目的是完全从Stego图像中恢复秘密信息,同时尽可能缩小封面图象图象之间的差别。 引入一个衡量比值,但缩缩度度度度度度度(比重度度度度度度度度的比重度度度度度度度度度范围)要确定封面图状图案的比比值的比值的比值的比值比值的比值也比值比值比值比值比值比值比值比值比值的比值可以进一步。