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EtherPEG was a program that sniffed for JPEGs passing by on the AirPort networks at MacHack, and showed them on the huge screen to shame people into a) turning the 802.11 encryption on, or b) reducing amount of pr0n they download at weirdo Mac conventions. DRIFTNET can do the same for *your* office, and make an attractive desktop accessory to boot. The program promiscuously sniffs and decodes any JPEG downloaded by anyone on your LAN, displaying it in an attractive, ever changing mosaic of fluffy kittens, oversized navigation buttons, and blurred images of Big Brother Elizabeth fiddling. It's UNIX only. Your sysadmin is undoubtedly running it already. So stop that. Now.

Cryptcat is the standard netcat enhanced with twofish encryption. Twofish is courtesy of counterpane, and cryptix. We started with the Java version of twofish from cryptix, converted it to C++ (don't ask why), and enhanced it by adding CBC mode and the ciphertext stealing technique from Applied Cryptography (pg. 196) How do you use it? Machine A: cryptcat -l -p 1234 < testfile Machine B: cryptcat <machine A IP> 1234 This is identical to the normal netcat options for doing exactly the same thing. However, in this case the data transferred is encrypted. For more information about netcat see net/netcat port.

This is a utility which locks a terminal so it can only be unlocked with the user's password (or the root password). It uses PAM authentication by default.

File::Flat implements a flat filesystem. A flat filesystem is a filesystem in which directories do not exist. It provides an abstraction over any normal filesystem which makes it appear as if directories do not exist. In effect, it will automatically create directories as needed. This is create for things like install scripts and such, as you never need to worry about the existence of directories, just write to a file, no matter where it is.

Sloth allows you to slow down a specified application by specifying (in miliseconds) the delay on the process. It slows down the process by sending SIGSTOP & SIGCONT signals to the process over a very fast period of time, giving the appearance of a slower application.

In order for Catalyst::Plugin::Session to work the session ID needs to be stored on the client, and the session data needs to be stored on the server. This plugin stores the session ID on the client using the cookie mechanism.

mod_dosevasive是Apache的一个规避策略模块，它为Apache在遭受一个HTTP DoS或DDoS攻击或者强制 攻击事件时提供规避行动。 它也是一个检测和管理网络的工具，可以方便地配置以便与ipchains、网络防火墙、路由器等进行交互。 mod_dosevasive目前可以通过电子邮件和syslog等设施来报告滥用行为。 检测是通过创建一个IP地址和URI的内部动态哈希表，并拒绝任何单一的IP地址的以下行为： * 每秒多次请求同一个页面 * 在同一个Apache Child上，每秒发起超过50个并发请求 * 在临时黑名单上（在阻止列表上）的IP，发起任意请求 这个方法对于单一服务器脚本攻击和分布式攻击同样行之有效，但是和其它规避工具一样，仅仅对保护带宽和 处理器消耗起作用（如，带宽总量和接收／处理／响应无效请求所需的处理器），因此，把它和你的网络防火 墙与路由器集成起来以达到最大保护，是个好主意。 这个模块为每个监听器单独地初始化一个实例，因此它有内建的清理机制和缩放功能。由于这种针对每个 Apache Child的设计，合法的请求从来不受影响（甚至是从代理和NAT地址），而仅仅针对脚本攻击。即使用户 重复地点击“刷新”也应该不受影响，除非他们不怀好意。mod_dosevasive完全通过Apache配置文件来配置， 很容易集成到你的web服务器上。

This module implements a trie data structure. The term "trie" comes from the word retrieval, but is generally pronounced like "try". A trie is a tree structure (or directed acyclic graph), the nodes of which represent letters in a word. For example, the final lookup for the word 'bob' would look something like $ref->{'b'}{'o'}{'b'}{'00'} (the 00 being an end marker). Only nodes which would represent words in the trie exist, making the structure slightly smaller than a hash of the same data set. The advantages of the trie over other data storage methods is that lookup times are O(1) WRT the size of the index. For sparse data sets, it is probably not as efficient as performing a binary search on a sorted list, and for small files, it has a lot of overhead. The main advantage (at least from my perspective) is that it provides a relatively cheap method for finding a list of words in a large, dense data set which begin with a certain string.

This module provides a WebDAV server. WebDAV stands for "Web-based Distributed Authoring and Versioning". It is a set of extensions to the HTTP protocol which allows users to collaboratively edit and manage files on remote web servers. Net::DAV::Server provides a WebDAV server and exports a filesystem for you using the Filesys::Virtual suite of modules. If you simply want to export a local filesystem, use Filesys::Virtual::Plain as above. This module doesn't currently provide a full WebDAV implementation. However, I am working through the WebDAV server protocol compliance test suite (litmus, see http://www.webdav.org/neon/litmus/) and will provide more compliance in future. The important thing is that it supports cadaver and the Mac OS X Finder as clients.

Algorithm::Numerical::Shuffle ============================= Shuffle is a perl module which performs a one pass, fair shuffle on a list. If the list is passed as a reference to an array, the shuffle is done in situ. The running time of the algorithm is linear in the size of the list. For an in situ shuffle, the memory overhead is constant; otherwise, linear extra memory is used. The algorithm used is discussed by Knuth [3]. It was first published by Fisher and Yates [2], and later by Durstenfeld [1].