1 Two Attacks on Reduced IDEA ( Extended Abstract )

  title={1 Two Attacks on Reduced IDEA ( Extended Abstract )},
  author={Johan Borst and Lars R. Knudsen and Vincent Rijmen}
In 1991 Lai, Massey and Murphy introduced the IPES (Improved Proposed Encryption Standard), later renamed IDEA (International Data Encryption Algorithm). In this paper we give two new attacks on a reduced number of rounds of IDEA. A truncated differential attack on IDEA reduced to 3.5 rounds and a differential-linear attack on IDEA reduced to 3 rounds. The truncated differential attack contains a novel method for determining the secret key. 
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Differential-Linear Cryptanalysis of IDEA

  • J. Borst
  • Technical Report ESATCOSIC Report 96-2,
  • 1997
2 Excerpts

Truncated Differentials of IDEA

  • L. R. Knudsen, V. Rijmen
  • Technical Report ESAT-COSIC Report 97-1,
  • 1997
1 Excerpt

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