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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Improved Side-Channel Attack on DES with the First Four Rounds Masked

  • Kim, Jong-Sung (Division of e-Business, Kyungnam University) ;
  • Hong, Seok-Hie (Center for Information Security Technologies (CIST), Korea University) ;
  • Han, Dong-Guk (Department of Mathematics, Kookmin University) ;
  • Lee, Sang-Jin (Center for Information Security Technologies (CIST), Korea University)
  • Received : 2009.05.11
  • Accepted : 2009.08.17
  • Published : 2009.10.31
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Abstract

This letter describes an improved side-channel attack on DES with the first four rounds masked. Our improvement is based on truncated differentials and power traces which provide knowledge of Hamming weights for the intermediate data computed during the enciphering of plaintexts. Our results support the claim that masking several outer rounds rather than all rounds is not sufficient for the ciphers to be resistant to side-channel attacks.

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References

  1. National Bureau of Standards, “Data Encryption Standard,” Federal Information Processing Standards Publication 46, Jan. 1977.
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  3. H. Handschuh and B. Preneel, “Blind Differential Cryptanalysis for Enhanced Power Attacks,” Proc. SAC 2006, LNCS, vol. 4356, 2007 pp. 163-173.
  4. L.R. Knudsen, “Truncated and Higher Order Differentials,” Proc. FSE 1994, LNCS, vol. 1008, 1995, pp. 196-211.
  5. M.L. Akkar, R. Bevan, and L. Goubin, “Two Power Analysis Attacks against One-Mask Methods,” Proc. CHES 2004, LNCS, vol. 3156, 2004, pp. 332-347.

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