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A recent paper by Bathe et al. proposed a differential fault injection attack on the stream cipher Espresso. The authors claimed that the injection of 4 random faults in the internal state was enough for state recovery. In this article we present an improved implementation of their technique - with modifications in both the pre-processing and the online phases. As a result we report internal state recovery of Espresso using only 3 injected faults in comparable time. Our experimental data also leads to some interesting observations regarding the dependence of the stages of the Espresso state.

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An Improved Differential Fault Attack on the Stream Cipher Espresso

  • 会议论文

  • 发表日期：

    2025年

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  • Debendranath Das,
  • Anirban Ghatak,
  • Indivar Gupta,
  • Sabyasachi Karati,
  • Arindam Mandal

摘要

A recent paper by Bathe et al. proposed a differential fault injection attack on the stream cipher Espresso. The authors claimed that the injection of 4 random faults in the internal state was enough for state recovery. In this article we present an improved implementation of their technique - with modifications in both the pre-processing and the online phases. As a result we report internal state recovery of Espresso using only 3 injected faults in comparable time. Our experimental data also leads to some interesting observations regarding the dependence of the stages of the Espresso state.