Dynamic WEP (WEP with 802.1X) avoids this by refreshing keys before the IV space is exhausted. Appropriate refresh intervals should be determined by looking at actual frame counts in your WLAN.
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
Encryption keys are never re-used by TKIP. TKIP combines a temporal key, the transmitter's address and TKIP Sequence Counter (TSC) to generate per-packet keys. If the TSC is exhausted, the standard requires communication to be discontinued or the temporal key to be regenerated. The TSC is 48 bits long, or 281,474,976,710,656. That's a very large number of frames. How long will it take for your WLAN to generate this many frames? At 802.11b data rates, you're talking many years.
The 802.11i standard specifies a maximum lifetime for temporal keys, defined as the minimum of any configured Pairwise Master Key Lifetime and any session timeout carried by RADIUS accept messages returned via 802.1X. That lifetime can cause the temporal key to be refreshed at regular intervals. But you don't need to set that lifetime based on TKIP key reuse. Think in terms of how long a user should really be authorized before requiring reauthentication.
Dig Deeper on Enterprise mobile security
Related Q&A from Lisa Phifer
Need to send an email, check your flight's status or get ready for a presentation? You can do it all on your smartwatch, thanks to a slew of Apple ...continue reading
New and improved management features have made Android devices more suitable for enterprise use, and API and EMM tools can streamline the device ...continue reading
Whether you need a basic open source mobile device management tool for your company's Apple or Android devices, or something more customized, you ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.