Abstract
In SAC 2013, Berger et al. defined Extended Generalized Feistel Networks (EGFN) and analyzed their security. Later, they proposed a cipher based on this structure: \( LILLIPUT \). Impossible differential attacks and integral attacks have been mounted on \( LILLIPUT \). We propose a tool which has found some classical, impossible and improbable differential attacks by using the variance method. It has highlighted unusual differential conditions which lead to efficient attacks according to the complexity. Moreover, it is the first time we apply the generic variance method to a concrete cipher.
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Notes
- 1.
Our tool is available on the Internet at this link: github.com/NicolasCergy/Lilliput_analysis.
- 2.
See Sect. 4.3.
- 3.
Mean value obtained in simulation with 5000 samples of 4 messages.
- 4.
See Sect. 4.3.
- 5.
’?’ means unknown bit and ’|’ means known bit.
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Marrière, N., Nachef, V., Volte, E. (2018). Differential Attacks on Reduced Round LILLIPUT. In: Susilo, W., Yang, G. (eds) Information Security and Privacy. ACISP 2018. Lecture Notes in Computer Science(), vol 10946. Springer, Cham. https://doi.org/10.1007/978-3-319-93638-3_12
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