windows password protection

对原始信号做DCT的算法：Cox 和Piva 等人提出的DCT技术的经典之作。Cox利用随机数发生器产生标准正态序列作为水印信息对图像进行整体DCT变换后，选取除去DC系数之外部分较低频率系数叠加水印信息 Piva则修改整幅图像的中频部分。对原始信号分块后，再作DCT的算法：Hsu和Wu 把图像进行8*8分块，将一个二进制序列作为水印放入DCT的中频区；有些学者则计算整个图像的DCT，把一个实数序列嵌入DCT的中频系数上。选择中频区的好处是一方面尽量减少嵌入信息对图像主观视觉的影响；同时，尽量避免有损压缩对水印信息可能带来的损失。还有一种DCT方法就是把水印信息嵌入到高频系数上，但是采用这种方法，抗压缩性非常差。-done to the original signal DCT algorithm : Cox Piva and others made the DCT technology classic. Cox using random number generator producing standard normal sequence information as a watermark image of the overall DCT, DC coefficient selection removed outside some lower frequency coefficient superposition watermark information Piva will be replaced by images of the entire IF part. The original signal block, before making the DCT algorithm : Wu Hsu and put images 8* 8 block, a binary sequence as watermarks Add DCT IF; Some scholars calculated whole image of DCT, a real sequence embedded IF DCT coefficients. IF the choice is a good one to minimize the embedded information to the sub

用三种方式进行文件缓存的操作，并通过比较平均时间来了解文件缓存的工作原理，涉及的主要API函数有CreateFile，ReadFile和WriteFile，GetOverlappedResult函数-Three way file cache operation, and by comparing the average time to understand the file cache

　VC对位图的操作比较烦琐，要显示一个位图到对话框上去，很麻烦。我在开发的过程中走通了两条路：一是使用Kodak图象编辑控件；二是利用Microsoft提供的例子中的一个类，并稍加改造。两种方法各有优缺点。我把它写下来，以避免其他人多走弯路。-VC right bitmap comparison cumbersome, to show that a bitmap to boost dialog, a lot of trouble. In the development process, taking a two-way : First, use Kodak Image Edit Control; Two Microsoft is using the example of a type, and modifying. Both methods have advantages and disadvantages. I put it down in writing in order to avoid the same mistakes other people.

motorola ezx平台的一个shell，界面非常友好-platform of a shell, a very friendly interface

HUST计算机学院研究生漏洞分析与利用的课件-Vulnerability analysis and exploit

read the internal kernel data structures, in order to get reliable information about the system state (like list of all processes, including those "hidden" by rootkits, even by fu )

控制系统的简单改进-simple control system to improve

金融业园区网与网络安全系统设计分析-financial industry park of Network Security System Design and Analysis

进程调度文件 -process scheduling paper documents

造字系统，用vfp完成-Defined system, complete with VFP