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sdfsdfas
- int bitmapHeight = button1.Top- 20 bitmap = new Bitmap(bitmapWidth, bitmapHeight, this.CreateGraphics()) Graphics g = Graphics.FromImage(bitmap) g.Clear(this.BackColor) g.FillEllipse(new SolidBrush(Color.YellowGreen),5,5 ,bitmapWidth
PlayfairCipher_codes
- Playfair Cipher 1.not even the large number of keys in a monoalphabetic cipher provides security 2.one approach to improving security was to encrypt multiple letters 3.the Playfair Cipher is an example 4.invented by Charles Wheatstone in 1854
bdpost
- 百度发贴机，具有自动发贴功能，百度顶贴功能-Baidu posts machines, with automatic posting feature, Baidu Post features the top
Set-top-boxes-Conditional-Access-
- Set-top boxes Conditional Access System cas principle
zishiyingjiami
- 为了提高图像加密算法的鲁棒性，提出了一种新的自适应图像加密算法。首先，把任意大小的灰度或彩 色图像分成2 × 2 子块 然后，用左上角子块的像素灰度值和Chebyshev 混沌映射构造与右上角子块等大的矩阵，用该 矩阵对右上角子块进行像素灰度值替换 最后，按顺时针对每个子块进行加密，直到左上角子块加密完毕。该算法不 依赖于图像的大小，而且适用于灰度图像和彩色图像，因而有很强的鲁棒性。同时灰度值扩散机制的引入使得该算 法具有良好的扩散性和扰乱性。-This paper presen