hw2 - the underlying RC4 algorithm is known to be secure?...

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2/15/2010 CSE 566 – Wireless Network Security Due: 2/26/2010 (5:00 pm) Homework 2 This Homework is due in my office (129 Bell) by 5:00 pm on the due date. Solution will be posted soon thereafter. 1) a.. Describe denial of service attacks in the context of wireless networks. b. What is the difference between DoS attack and DDoS attack? 2) With the help of a neat diagram, explain how the shared key authentication works in WEP. 3) What is the Wi-Fi “Evil Twin” attack in wireless networks? How can you mitigate this problem? 4) a. Differentiate between active scanning and passive scanning for wireless association. b. Using the scan reports what attacks can a potential adversary perform. 5) Define the following terms in brief: a. CSMA b. CSMA/CD c. CSMA/CA d. Why is CA chosen over CD for 802.11? Explain from the point of view of the transmitting and receiving stations. 6) Explain KSA and PRGA used in WEP. a. What feature of these algorithms makes WEP vulnerable to the FMS attack despite the fact that
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Unformatted text preview: the underlying RC4 algorithm is known to be secure? b. Elaborate how weak IVs leak information. 7) In the infrastructure mode, describe briefly the following operations (indicate the context). a. Association b. Re-association c. Dissociation d. Authentication e. De-authentication 8) Show where the supplicant, authenticator and authorizer (authentication server) reside in a mobile node and in an access point? 9) Explain the working of any three of the following a. WPA b. RSN c. 802.1X d. EAP e. EAPOL f. RADIUS You must answer questions 1, 2, 3 and 9 and any two additional questions. Rest of the questions may be viewed as practice problems for midterm 1. For all questions, brief and to-the-point answers are expected. You may refer to any of the text books or resources on the web. If you have got the solutions from the Internet, do not forget to include the references....
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