Images can be expressed into a linear combination of image base, and this expression can remove the correlation of the space domain, so the energy concentrate in a small part of transformed coefficients. 图像可以通过图像基的线性组合来表示,这种表示可去除图像在空间域的相关性,使能量集中在少数的变换系数上。
This paper presents how to search the LFSR ( the linear Feedback Shift Register ) feedback polynomials through combination and enumeration, and how to blindly restore the initial states of LFSR through fast correlation attack based on convolutional codes. 首先通过组合枚举方法寻找伪随机扰码序列的反馈多项式,然后利用基于卷积码的快速相关攻击方法对线性反馈移位寄存器(LFSR)的初态进行盲恢复。