A wireless LAN attack that illustrates the vulnerabilities of using an unencrypted public hotspot is called Firesheep. Firesheep, a free open-source Firefox browser extension, allows a user to connect to an unencrypted wireless network and then imitate any other person who is connected to the same network through a technique known as "sidejacking." Use the Internet to research Firesheep. How does it work? What are the defenses against it? What are the risks of using an unencrypted hotspot.