ETRI Journal

  • 제37권5호
  • /
  • Pages.1012-1022
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  • 2015
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  • 1225-6463(pISSN)
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  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
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Conditional Re-encoding Method for Cryptanalysis-Resistant White-Box AES

  • Lee, Seungkwang (SW & Contents Research Laboratory, ETRI) ;
  • Choi, Dooho (SW & Contents Research Laboratory, ETRI, University of Science & Technology (UST)) ;
  • Choi, Yong-Je (SW & Contents Research Laboratory, ETRI)
  • 투고 : 2014.01.27
  • 심사 : 2015.08.07
  • 발행 : 2015.10.01
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초록

Conventional cryptographic algorithms are not sufficient to protect secret keys and data in white-box environments, where an attacker has full visibility and control over an executing software code. For this reason, cryptographic algorithms have been redesigned to be resistant to white-box attacks. The first white-box AES (WB-AES) implementation was thought to provide reliable security in that all brute force attacks are infeasible even in white-box environments; however, this proved not to be the case. In particular, Billet and others presented a cryptanalysis of WB-AES with 230 time complexity, and Michiels and others generalized it for all substitution-linear transformation ciphers. Recently, a collision-based cryptanalysis was also reported. In this paper, we revisit Chow and others's first WB-AES implementation and present a conditional re-encoding method for cryptanalysis protection. The experimental results show that there is approximately a 57% increase in the memory requirement and a 20% increase in execution speed.

키워드

참고문헌

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피인용 문헌

  1. One-Bit to Four-Bit Dual Conversion for Security Enhancement against Power Analysis vol.ea99, pp.10, 2016, https://doi.org/10.1587/transfun.e99.a.1833
  2. Light-weight white-box encryption scheme with random padding for wearable consumer electronic devices vol.63, pp.1, 2015, https://doi.org/10.1109/tce.2017.014722
  3. A Masked White-Box Cryptographic Implementation for Protecting Against Differential Computation Analysis vol.13, pp.10, 2015, https://doi.org/10.1109/tifs.2018.2825939
  4. A White-Box Cryptographic Implementation for Protecting against Power Analysis vol.ed101, pp.1, 2018, https://doi.org/10.1587/transinf.2017edl8186