Ncrack是一个高速的网络认证破解工具，它可以帮助企业测试所有的网络主机和网络设备的密码强度，提高企业网络的安全性。安全专业人员也可使用Ncrack做渗透测试。Ncrack采用了模块化设计，类似Nmap的命令行语法和一个动态的引擎，该引擎是Ncrack可以依据不同的网络反馈自适应操作。Ncrack可以可靠的进行大规模网络主机安全审计。Ncrack支持windows和linux系统，目前更新至0.4版，该版本主要改变：

•     Added the VNC module to Ncrack’s arsenal. Thanks to rhh of rycon.hu for implementing the module and discussing about it for further improvement.
•     Wrote the Ncrack Developer’s Guide, which is meant to give an overall insight into Ncrack’s architecture and help programmers develop their own modules (http://nmap.org/ncrack/devguide.html)
•     Fixed critical bug in RDP module, which caused Ncrack to fail cracking some Windows 2003 server versions.
•     Added a mechanism (MODULE_ERR), which modules can use to report to the Ncrack engine that the authentication wasn’t completed due to an application error. For instance, the VNC server often notifies the client that there are “too many authentication failures” and Ncrack can then close the running connections and wait some time until the above wears off.
•     Ncrack can now print the nsock EID (unique connection ID) in debugging messages. This will greatly help us track problems, since error messages will be matched to certain connections.

工具更多信息及下载：http://nmap.org/ncrack/
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Ncrack is a high-speed network authentication cracking tool. It was built to help companies secure their networks by proactively testing all their hosts and networking devices for poor passwords. Security professionals also rely on Ncrack when auditing their clients. Ncrack was designed using a modular approach, a command-line syntax similar to Nmap and a dynamic engine that can adapt its behaviour based on network feedback. It allows for rapid, yet reliable large-scale auditing of multiple hosts.