[PCI-DSS] 4.1.1 Ensure wireless networks transmitting cardholder data or connected to the cardholder data environment, use industry best practices (for example, IEEE 802.11i) to implement strong encryption for authentication and transmission.
[ul]
[li] For new wireless implementations, it is prohibited to implement WEP after March 31, 2009.[/li][li]For current wireless implementations, it is prohibited to use WEP after June 30, 2010.[/li][/ul]
4.1.1 For wireless networks transmitting cardholder data or connected to the cardholder data environment, verify that industry best practices (for example, IEEE 802.11i) are used to implement strong encryption for authentication and transmission.