Specifications

Chapter 8 Security Setup
Enabling Additional WEP Security Features
8-14
Cisco Aironet Access Point Software Configuration Guide
OL-0657-07
Note The MIC, TKIP, and broadcast key rotation features are available in firmware
versions 11.10T and later, which are available on Cisco.com. You can
download Cisco Aironet firmware releases at
http://www.cisco.com/public/sw-center/sw-wireless.shtml.
Enabling Message Integrity Check (MIC)
MIC prevents attacks on encrypted packets called bit-flip attacks. During a bit-flip
attack, an intruder intercepts an encrypted message, alters it slightly, and
retransmits it, and the receiver accepts the retransmitted message as legitimate.
The MIC, implemented on both the access point and all associated client devices,
adds a few bytes to each packet to make the packets tamper-proof.
Note You must set up and enable WEP with full encryption before MIC takes effect.
Note To use MIC, the Use Aironet Extensions setting on the AP Radio Advanced
page must be set to yes (the default setting).
Use the AP Radio Advanced page to enable MIC. Figure 8-7 shows the AP Radio
Advanced page.