Security Issues of IEEE 802.11b

Security Issues of IEEE 802.11b Wireless Local Area Networks Issues | Analysis | Suggestions | Solutions | Adaptations Seminar on Security Issues of 802.11b presented on 21-10-2008 by Sreekanth G S, 274, R7, Computer Science, Sree Chitra Thirunal College of Engineering

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[object Object],[object Object],RC4 Algorithm (contd…) The key-scheduling algorithm (KSA) The key-scheduling algorithm is used to initialize the permutation in the array "S". "keylength" is defined as the number of bytes in the key and can be in the range 1 ≤ keylength ≤ 256, corresponding to a key length of 40 – 128 bits. First, the array "S" is initialized to the identity permutation. S is then processed for 256 iterations. for i from 0 to 255 S[i] := i endfor j := 0 for i from 0 to 255 j := (j + S[i] + key[i mod keylength]) mod 256 Swap (S[i],S[j]) endfor

[object Object],[object Object],RC4 Algorithm (contd…) The pseudo-random generation algorithm (PRGA) For as many iterations as are needed, the PRGA modifies the state and outputs a byte of the keystream. In each iteration, the PRGA increments i , adds the value of S pointed to by i to j , exchanges the values of S[ i ] and S[ j ], and then outputs the value of S at the location S[i] + S[j] (modulo 256). Each value of S is swapped at least once every 256 iterations. i := 0 j := 0 while GeneratingOutput: i := (i + 1) mod 256 j := (j + S[i]) mod 256 Swap(S[i],S[j]) Output S[(S[i] + S[j]) mod 256] ^ input[i] endwhile

[object Object],[object Object],RC4 Algorithm (contd…) Test Vectors Sample test vectors are provided below: RC4( "Key", "Plaintext" ) == BBF316E8D940AF0AD3 RC4( "Wiki", "pedia" ) == 1021BF0420 RC4( "Secret", "Attack at dawn" ) == 45A01F645FC35B383552544B9BF5 OR In Plain/Text: Password: Text: Output: RC4( "24g3", "24z0") == nhnW RC4( "24g3", "24z2") == nhnU RC4( "5ybdt", "5ybu8") == XJrkp

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Based On: Security issues of the IEEE 802.11b wireless LAN Boland, H. Mousavi, H. Carleton University, Ottawa, Ont., Canada IEEE Canadian Conference on Electrical and Computer Engineering, 2-5 May 2004

[object Object],[object Object],[object Object],[object Object],http://www.sreekanth.in [email_address] +91.9446384450

Security Issues of IEEE 802.11b

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