Quoting from Macworld:<br>"Say you're in a coffee shop with Airport wireless access to the Internet. You use a Powerbook to check your email, upload a few files to a web server, read some web pages, and then put the machine to sleep. That's when you notice someone looking at your laptop with a suspicious gleam in his eye, so decide to leave.<br><br>Next time you use a laptop, there's a text file you didn't create on the OSX desktop: it's a friendly note from that guy in the coffee shop - and it contains your email and ftp user names and passwords, along with a list of the URLs you surfed while sipping.<br><br><br><br>Airport commonly known as outside the mac community as WiFi (or more technically IEEE 802.11b), sends data back and forth without securing the connection between a wireless client and an Airport base station or similar hub.<br><br>User names and passwords for email accouts, FTP servers, and insecure Web sites are transmitted as plain text, so any other user on the same wireless network detect this information, along with the plain text of any email message you send or receive, and any file you transmit or download.<br><br>Airport's built-in encryption system doesn't protect Macs from other users on the same network, and the encryption itself has major flaws. When you use public wireless networks such as Wayport, Surf and Sip, or T-Mobile in airports, hotels and coffee shops (mainly in the US, currently), the built-in encryption doesn't even come into play: your data is always unencoded."<br><br>http://raszl.net
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