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Identity and Privacy in the Internet Age

Volume 5838 of the series Lecture Notes in Computer Science pp 120-132

An Improved Attack on TKIP

  • Finn M. HalvorsenAffiliated withLancaster UniversityDep. of Telematics, Norwegian University of Science and Technology
  • , Olav HaugenAffiliated withLancaster UniversityDep. of Telematics, Norwegian University of Science and Technology
  • , Martin EianAffiliated withLancaster UniversityDep. of Telematics, Norwegian University of Science and Technology
  • , Stig F. MjølsnesAffiliated withLancaster UniversityDep. of Telematics, Norwegian University of Science and Technology

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Abstract

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.