题目内容
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[多选题]
仿射变换的特点是（)。
A.要实现仿射变换，需要知道不在同一直线上的3对控制点的数字化坐标及其理论值
B.不用方向上的长度比发生变化
C.直线变换后仍为直线
D.平行线变换后仍为平行线
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.要实现仿射变换，需要知道不在同一直线上的3对控制点的数字化坐标及其理论值
B.不用方向上的长度比发生变化
C.直线变换后仍为直线
D.平行线变换后仍为平行线
如果结果不匹配，请 联系老师 获取答案
更多“仿射变换的特点是()。”相关的问题
A.①②④③
B.②①③④
C.①②③④
D.②①④③
,其中,常数k＞0,则称τ是同位相似(或相似),称O为位似中心,k称为位似系数.(1)适当选取标架,求出位似τ的公式;
(2)证明位似是仿射变换:
(3)证明位似保持角度不变;
(4)证明位似可以分解成某两个伸缩的乘积.
截取一段明文如下:
The Mutual Information Analysis (MIA) is a generic side channel distingui she that has been introduced at CHES 2008. This paper brings three contributions with respect to its applicability to practice. First, we emphasize that the MIA principle can be seen as a toolbox in which different (more or less effective) statistical methods can be plugged in. Doing this, we introduce interesting altematives to the original proposal. Second, we discuss the contexts in which the MIA can lead to successful key recoveries with lower data complexity than classical attacks such as, eg. using Pearson's correlation coefficient. We show that such contexts exist in practically meaningful situations and analyze them statistically. Finally, we study the connections and differences between the MIA and a framework for the analysis of side- channel key recovery published at Eurocrypt 2009. We show that the MIA can be used to compare two leaking devices only if the discrete models used by an adversary to mount an attack perfectly correspond to the physical leakages.
忽略文中的数字和符号，试用(1.9)仿射密码加密。然后对密文进行破密。
