Airport Express & Extreme use WPA/WPA2 security which is the same used by all other modern wireless devices.
The original poster's question had to do with setting up a streaming network. He's already got a wi-fi network so would assume he's comfortable with wireless security issues. Adding a wi-fi Touch will not make anything worse in this regard.
The original poster's question had to do with setting up a streaming network. He's already got a wi-fi network so would assume he's comfortable with wireless security issues. Adding a wi-fi Touch will not make anything worse in this regard.