"Apple has updated its AirPort wireless networking system, with new, version 2.0 software and a modified base-station to improve network security and accessibility.
The updated software adds 128-bit encryption to protect data transmitted across the network. AirPort, which is based on the standard IEEE 802.11b specification, used Wired Equivalent Privacy (WEP) to encrypt transmissions. Previously, AirPort supported only 40-bit encryption." The Register.