Data confidentiality and origin authentication is

Info icon This preview shows pages 28–31. Sign up to view the full content.

View Full Document Right Arrow Icon
Data confidentiality and origin authentication is provided as follows: Suppose node A and node B share a PMK and wish to communicate. As- sume that node A initiates the communication by sending an initial message to node B. Node A will use TK as the encryption key for this message. It Copyright © 2010. World Scientific Publishing Company. All rights reserved. May not be reproduced in any form without permission from the publisher, except fair uses permitted under U.S. or applicable copyright law. EBSCO Publishing : eBook Collection (EBSCOhost) - printed on 2/16/2016 3:46 AM via CGC-GROUP OF COLLEGES (GHARUAN) AN: 340572 ; Beyah, Raheem, Corbett, Cherita, McNair, Janise.; Security in Ad Hoc and Sensor Networks Account: ns224671
Image of page 28

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
16 A. Naveed and S. Kanhere CounterModeAES PairwiseMasterKey ( PMK ) PairwiseT ransientKey ( PT K ) T emporalKey ( T K ) PRF 128 InitialCounterblock/NonceN 0 IEEE 802 . 11 i Proposed Extension Fig. 3. Key generation mechanism. will encrypt the first message along with the nonce N 0 (generated using Fig. 3) and the Meta Data using Eq. (1). E T K ( N 0 || Data || MetaData ) (1) The field Meta Data is used for message integrity and is beyond the scope of this chapter. The intended recipient (node B), upon receiving the message will also generate the initial counter (also the nonce N 0 ) using the procedure shown in Fig. 3. It will decrypt the message using Eq. (2), TK being the decryption key. After decryption, node B will compare its own generated nonce value with the received nonce. Since both nodes A and node B share the PMK, the N 0 generated should be the same as the N 0 which was transmitted as a part of the message by node A. The nonce will act as challenge text to authenticate the source of the message. D T K ( E T K ( N 0 || Data || MetaData )) = N 0 || Data || Metadata (2) Node B will then use N 0 as the encryption key for the reply, rather than the TK. PRF-128 will be used to generate a new nonce N 1 , which will be concatenated with the data and Meta Data , encrypted using N 0 and transmitted back to Node A. Thus, a new nonce is generated iteratively for each subsequent message, which enhances the robustness of the security Copyright © 2010. World Scientific Publishing Company. All rights reserved. May not be reproduced in any form without permission from the publisher, except fair uses permitted under U.S. or applicable copyright law. EBSCO Publishing : eBook Collection (EBSCOhost) - printed on 2/16/2016 3:46 AM via CGC-GROUP OF COLLEGES (GHARUAN) AN: 340572 ; Beyah, Raheem, Corbett, Cherita, McNair, Janise.; Security in Ad Hoc and Sensor Networks Account: ns224671
Image of page 29
Authentication and Confidentiality in Wireless Ad Hoc Networks 17 NodeA NodeB E T K ( N 0 || Data 1 || MD ) E N 0 ( N 1 || Data 2 || MD ) E N 1 ( N 2 || Data 3 || MD ) E N 2 ( N 3 || Data 4 || MD ) E N i - 2 ( N i 1 || Data i || MD ) Fig. 4. Per frame authentication mechanism. solution. Node A will employ the aforementioned decryption process to re- trieve the message and authenticate (using the response nonce) the sender.
Image of page 30

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 31
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern