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Password sniffers are programs that simply collect the first 128 or more bytes of each network connection on the network that they want to attack. When a user types in a user name and a password--as required when using certain common Internet services like FTP (which is used to transfer files from one machine to another) or Telnet (which lets the user log in remotely to another machine)--the sniffer collects that information. Additional programs sift through the collected information, pull out the important pieces (e.g., the user names and passwords), and cover up the existence of the sniffers in an automated way. Best estimates are that in 1994 as many as 100,000 sites were affected by sniffer attacks.
Kavungya answered the question on May 17, 2019 at 09:23
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