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This e-book const?tutes the completely refereed postproceedings of the 4th overseas convention at the complex Encryption general, AES 2004, held in Bonn, Germany in may perhaps 2004.

The 10 revised complete papers awarded including an introductory survey and four invited papers through major researchers have been conscientiously chosen in the course of rounds of reviewing and development. The papers are prepared in topical sections on cryptanalytic assaults and comparable issues, algebraic assaults and comparable effects, implementations, and different themes. All in all, the papers represent a newest overview of the cutting-edge of information encryption utilizing the complicated Encryption average AES, the de facto international average for facts encryption.

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Additional info for Advanced Encryption Standard – AES: 4th International Conference, AES 2004, Bonn, Germany, May 10-12, 2004, Revised Selected and Invited Papers

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Contained in the proof of Theorem 1 in [23]. Remark 5. Clearly if wt(γa ) + wt(γb ) = Bl , then Wl [γa , γb ] ≤ (2n − 1). Further, the values χ(w,i) and υ (w,j) depend only on γa and γb , not on the specific values of a and b. Lemma 4. Given a, b ∈ {0, 1}N \ 0 that satisfy wt(γa ) + wt(γb ) > Bl , let W = Wl [γa , γb ], f = wt(γa ), = wt(γb ), and let χ(w,i) , υ (w,j) be defined as above. Consider the vectors Vw in (10). Select any (f + −Bl ) vector positions, and fix a value in {0, 1}n \ 0 for each position.

SpringerVerlag, 1997. 11. National Institute of Standards and Technology. FIPS PUB 197: Advanced Encryption Standard, 2001. 12. G. -J. Quisquater. A Differential Fault Attack Technique Against SPN Structures, with Application to the AES and Khazad. D. K. Ko¸c, and C. Paar, editors, Cryptographic Hardware and Embedded Systems – CHES 2003, volume 2779 of Lecture Notes in Computer Science, pages 77–88. SpringerVerlag, 2003. 13. S. Skorobogatov and R. Anderson. Optical Fault Induction Attack. In B. K.

If we assume that we are in the worst case, then we obtain 14 possible values for Mj9 for each faulty ciphertext. DFA on AES 41 If we obtain another faulty ciphertext with an induced fault on Mj9 we obtain another set of possible values for Mj9 . In each set we have the correct value of Mj9 , so to identify this value the other 13 values must be different from each other. If we denote by A the set of these 13 values obtained with the first faulty ciphertext and by B the set of the possible values obtained with the second faulty ciphertext except the correct value of Mj9 , we have only one possible value left for Mj9 with probability : P2 = P (A ∩ B = Ø) =P (|A ∩⎞ B| = 0) ⎛ ⎛ ⎞ 255 255 − 13 ⎠ ⎝ ⎠ ∗⎝ 13 13 ⎛ ⎞2 = 255 ⎠ ⎝ 13 50% (33) With a third faulty ciphertext with an induced fault on Mj9 we obtain yet another set of 14 possible values for Mj9 .

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