电脑攻击与防御heAttackandDefenseofComputersDr.许.ppt

電腦攻擊與防禦 The Attack and Defense of Computers Dr. 許 富 皓 Sniffer Packet Sniffer A Packet sniffer (also known as network or protocol analyzer or Ethernet sniffer) is computer software (usually) or computer hardware that can intercept and log traffic passing over a digital network or part of a network. As data streams travel back and forth over the network, the sniffer captures each packet and eventually decodes and analyzes its content according to the appropriate RFC or other specifications. DOWNLOAD AREA Sniffers – Windows Qarchive Sniffers - Linux Badware/Spyware Badware Badware is malicious software that tracks your moves online and feeds that information back to shady marketing groups so that they can ambush you with targeted ads. If your every move online is checked by a pop-up ad, its highly likely that you, like 59 million Americans, have spyware or other malicious badware on your computer. Whats particularly tricky about badware is that you may not know that you downloaded it. Some badware manufacturers bundle it with other programs without disclosing that its part of the package. Others put their programs on your PC when you visit certain websites play online games.  Side-Effect Incessant pop-up ads arent the only possible side-effect. Sometimes peoples computers slow down or even crash. Sometimes peoples personal information is abused, and there have been reported cases of identity theft. Whats even more frustrating is that these programs are hidden in your computer, making it difficult to identify and remove them.  Why do badware providers make the effort? Ans. It is big business, amounting to more than a $2 billion-a-year industry. Its the Wild West of aggressive marketing and an industry supported by shadowy online marketers, small application vendors, and website operators. Dangerous Web Site [stopbadware] Google search keyword: 020 Dangerous Web Site Google search keyword: 0451/shop/ Dangerous Web Site Google search keyword: 01/ Dang