An Improved Attack on TKIP
Beck and Tews described the first practical cryptographic attack on IEEE 802.11i TKIP in November 2008, and this paper continues this line of protocol cryptanalysis. We show that their attack on TKIP can be used to create an ARP poisoning attack and a cryptographic DoS attack. Moreover, we are able to decrypt DHCP ACK packets, which are over 12 times longer than the ARP packet used by Beck and Tews. Our method of analysis recovers 596 bytes of keystream that can be used in new attacks on other control protocol messages.
KeywordsMedium Access Control Domain Name System Network Address Translation Medium Access Control Address Address Resolution Protocol
Unable to display preview. Download preview PDF.
- 1.Beck, M., Tews, E.: Practical attacks against WEP and WPA. Cryptology ePrint Archive Report 472, 79–86 (2008)Google Scholar
- 2.KoreK: chopchop (Experimental WEP attacks) (2004), http://www.netstumbler.org/f50/chopchop-experimental-wep-attacks-12489/
- 3.IEEE Standard for Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. IEEE Std 802.11-2007 (Revision of IEEE Std 802.11-1999) (2007)Google Scholar
- 6.Bittau, A., Handley, M., Lackey, J.: The Final Nail in WEP’s Coffin Security and Privacy. In: IEEE Symposium on, pp. 386–400 (2006)Google Scholar
- 7.Tews, E., Weinmann, R.-P., Pyshkin, A.: Breaking 104 bit WEP in less than 60 seconds. Cryptology ePrint Archive 120 (2007)Google Scholar
- 8.KoreK.: Next generation of WEP attacks (2004), http://www.netstumbler.org/showpost.php?p=93942&postcount=35