With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cd11IfVlanEncryptKeyTable
Cisco DOT11 Interfaces Vlan Encrypt Key Table
1.3.6.1.4.1.9.9.272.1.1.1.9
This table contains shared WEP keys for all IEEE 802.11 packets transmitted and received frames over a VLAN identified by the cwvlWlanVlanId if both VLAN and encryption are enabled (i.e., the cwvlWlanEncryptionMode is wep(2) or aes(3)) on the radio interface. If WEP encryption is enabled for the transmitted IEEE 802.11 frames, then the Default Shared WEP key in the set is used to encrypt the transmitted broadcast and multicast frames associated with the cwvlWlanVlanId. Key '1' in the set is the default key. If an individual session key is not defined for the target station address, then the Default Shared WEP key will also be used to encrypt or decrypt unicast frames associated with the cwvlWlanVlanId.
Back to CISCO-DOT11-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cd11IfVlanEncryptKeyTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.