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Sökning: WFRF:(Bagheri Nasour)

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1.
  • Abdelraheem, Mohamed Ahmed, et al. (författare)
  • Improved Linear Cryptanalysis of reduced-round SIMON-32 and SIMON-48
  • 2015
  • Ingår i: Progress in Cryptology - INDOCRYPT 2015. - Cham : Springer International Publishing. - 9783319266169 - 9783319266176 ; , s. 153-179
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we analyse two variants of SIMON family of light-weight block ciphers against linear cryptanalysis and present the best linear cryptanalytic results on these variants of reduced-round SIMON to date. We propose a time-memory trade-off method that finds differential/linear trails for any permutation allowing low Hamming weight differential/linear trails. Our method combines low Hamming weight trails found by the correlation matrix representing the target permutation with heavy Hamming weight trails found using a Mixed Integer Programming model representing the target differential/linear trail. Our method enables us to find a 17-round linear approximation for SIMON-48 which is the best current linear approximation for SIMON-48. Using only the correlation matrix method, we are able to find a 14-round linear approximation for SIMON-32 which is also the current best linear approximation for SIMON-32. The presented linear approximations allow us to mount a 23-round key recovery attack on SIMON-32 and a 24-round Key recovery attack on SIMON-48/96 which are the current best results on SIMON-32 and SIMON-48. In addition we have an attack on 24 rounds of SIMON-32 with marginal complexity.
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2.
  • Sadeghi, Sadegh, et al. (författare)
  • Cryptanalysis of reduced QTL block cipher
  • 2017
  • Ingår i: Microprocessors and microsystems. - : Elsevier BV. - 0141-9331 .- 1872-9436. ; 52, s. 34-48
  • Tidskriftsartikel (refereegranskat)abstract
    • Recently, a new ultra lightweight block cipher called QTL has been proposed. The authors claim to achieve a fast diffusion in QTL by using a new variant of a generalized Feistel network structure that changes all block messages in one iterative round in contrast to traditional Feistel-type structures changing only half of block messages. In this paper, we evaluate the security claims of the designers and show that their claims are not valid as QTL is vulnerable to the standard statistical attacks on block ciphers.
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Abdelraheem, Mohamed ... (2)
Bagheri, Nasour (2)
Alizadeh, Javad (1)
Alkhzaimi, Hoda A. (1)
Aref, Mohammad Reza (1)
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