1.theree -way handshake A TCP SYN packet is sent from the device that wishes to establish a connection with a  port of the device the it derires to connect with ,if the service assoicated with the receiving port accepts the connection , it will repla…

1.Zombie Scanning with Nmap Zombie scans can also be performed with an option in Namp ,  we can findly viable zombie candidates by sweeping an entire address range and assessing the IpID  sequence pattern with metasploit  :    we can use the metasplo…

1.connect scanning with Scapy,   Tools that perform  Tcp scans operate by performing a full there-way handshake to establish a connection with all od the scanned ports on the remote targets system ,a ports status is determined based on  whether a com…

一个SVN上的项目,在本地重新CheckOut打开后,一直提示"scanning for working copies"且不能使用SVN的更新.提交等功能,当时想着晾它一晚上,看能不能执行完(当时是有一个进度条的),结果第二天早上发现还是提示"scanning for working copies",且进度条一点没有走,当时那个气愤无语啊:上网搜了一下,基本上都是英文的帖子,且答案都不靠谱(或许是跟我这个不对症吧),什么删除掉project.xcodeproj文件下…

http://blog.csdn.net/duyiwuer2009/article/details/7964795 认识僵尸进程 1.如果父进程先退出 子进程自动被 init 进程收养,不会产生僵尸进程 2.如果子进程先退出 2.1 父进程 wait() 处理,则僵尸进程会被父进程清理 2.2 如果父进程不用 wait() 处理,则僵尸进程会在父进程退出之前一直存在.当然,父进程退出后,僵尸子进程会被 init 收养,init 进程会自动调用 wait() 处理.但是对于处理网络请求的服务器进程…

导读 Docker毫无疑问是近期运维同学们的热点话题,Docker安全也由此倍受重视,Docker Security Scanning 是一款Docker镜像扫描的安全工具,目前已经在Docker Cloud投入使用. 今天我们宣布 Docker Security Scanning(Docker安全扫描,原名项目鹦鹉螺)全面上市.Security Scanning 目前以一个服务附加在 Docker Cloud 私有仓库和位于Docker Hub的官方仓库.Security Scanning 为…

当我们对于内存进行手动管理的时候,会出现两种错误:一种是野指针错误,一种则为内存泄露.这两点也是我们去管理内存时最终要解决的问题. 内存泄漏是指:不在使用的对象,一直保留在内存中未被销毁,一直占有着内存,耗费内存资源直至程序结束. 野指针则是指:当一个指针指向一个对象时,此对象已经被系统回收.然后当再次通过该指针去操作对象时,则会出现野指针错误.而当系统回收该对象时,并不会立即销毁,而此时,该对象则成为僵尸对象. 在开发过程中,有人可能发现,有时僵尸对象也能访问.这是为什么呢?主要原因是因为XC…

In this Spring auto component scanning tutorial, you learn about how to make Spring auto scan your components. In this article, we show you how to do component filter in auto scanning process. 1. Filter component – include See following example to us…

Normally you declare all the beans or components in XML bean configuration file, so that Spring container can detect and register your beans or components. Actually, Spring is able to auto scan, detect and instantiate your beans from pre-defined proj…

宏块在经过变换.量化后,得到大小为4x4或者8x8的矩阵,矩阵中的数据被称为transform coefficient levels.这些level在后面会被用于熵编码,因此我们需要把矩阵按照一定顺序进行扫描,得到数字序列. 扫描顺序在帧与场会有所不同 4x4块矩阵的扫描顺序如下                Zig-zag scan(Frame)                          Field scan 8x8块矩阵的扫描顺序如下             Zig-zag scan…