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By Hans Dobbertin, Vincent Rijmen, Visit Amazon's Aleksandra Sowa Page, search results, Learn about Author Central, Aleksandra Sowa,

ISBN-10: 3540265570

ISBN-13: 9783540265573

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

The 10 revised complete papers provided including an introductory survey and four invited papers via top researchers have been conscientiously chosen in the course of rounds of reviewing and development. The papers are equipped in topical sections on cryptanalytic assaults and comparable themes, algebraic assaults and comparable effects, implementations, and different themes. All in all, the papers represent a most recent evaluate of the cutting-edge of knowledge encryption utilizing the complicated Encryption common AES, the de facto international ordinary 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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3 Outline of the Attack An efficient exhaustive search of the kini , kτ1 and kτ2 keys could be performed in the following way: First step : Cipher the 232 chosen plaintexts for all possible values of the quartet (x0 , x1 , x2 , x3 ). Second step : For kini from (0,0,0,0) to (255,255,255,255) do Partition the (256)4 chosen plaintexts into (256)3 Λc sets according the value of the triplet c Choose into those (256)3 Λc sets 216 values of c For each value of the (c , c ) pair do For kτ1 from (0, · · · , 0) to (255, · · · , 255) do Compute the values of (τ1c ⊕ τ1c )y=0···15 from the ciphertexts Put them in a table Tkini ,c ,c [kτ1 ] End For For kτ2 from (0, · · · , 0) to (255, · · · , 255) do Compute the values of (τ2c ⊕ τ2c )y=0···15 from the ciphertexts Look in the table Tkini ,c ,c [kτ1 ] if the same values appear If yes, verify the same computation for all the y values If equality for all y values, return (kini , kτ1 , kτ2 ) Else continue End If End For End For End For Since the above procedure tests whether the exist collisions inside a random set of 2562 of the 2564 possible sc [y] functions, the probability of the procedure to result in a collision, and thus to provide kini , kτ1 and kτ2 is high (say about 1/2).

DFA is frequently used nowadays to test the security of cryptographic smartcards applications, especially those using the DES. On the 2nd October 2000, the AES was chosen to be the successor of the DES and, since then, it is used more and more in smartcards applications. So it seems interesting to investigate what is feasible on the AES by using DFA. Unfortunately, the DFA attack on symmetric cryptosystems proposed by Biham and Shamir [4] does not work on the AES. This is why we work to find a way to attack the AES by using DFA.

K. Lenstra. Memo on RSA Signature Generation in the Presence of Faults. Manuscript, 1996. com. 10. P. Maher. Fault Induction Attacks, Tamper Resistance, and Hostile Reverse Engineering in Perspective. In R. Hirschfeld, editor, Financial Cryptography – FC ’97, volume 1318 of Lecture Notes in Computer Science, pages 109–121. 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.

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