Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pharming is a hacker''s attack aiming to redirect a website''s traffic to another, bogus website. Pharming can be conducted either by changing the hosts file on a victim''s computer or by exploitation of a vulnerability in DNS server software. DNS servers are computers responsible for resolving Internet names into their real addresses they are the "signposts" of the Internet. Compromised DNS servers are sometimes referred to as "poisoned".