针对位平面复杂度分割密写易受复杂度直方图攻击的问题，提出了一种密写改进算法，即用类噪声块一半的像素嵌入秘密信息，另一半用改变像素值的方法来调整区域的整体复杂度，以达到抗攻击的目的。实验结果表明，改进的算法能很好的抵抗复杂度直方图攻击。

This paper aimed at solving the problem of using complexity histogram steganalysis to BPCS steganography(Bit Plane Complexity Segmentation Steganography) and presented an improved method. For compensating the BPCS security deficiency, we used a half pixels of “noise like” block for embedding secret information, and the other half pixels were used for adjusting complexity. Experiment results showed this method can properly counteract the attack of complexity histogram.