Truncated Impossible and Improbable Differential Analysis of ASCON

Date

2016-02-01

Author

Tezcan, Cihangir

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Ascon is an authenticated encryption algorithm which is recently qualified for the second-round of the Competition for Authenticated Encryption: Security, Applicability, and Robustness. So far, successful differential, differential-linear, and cube-like attacks on the reduced-round Ascon are provided. In this work, we provide the inverse of Ascon's linear layer in terms of rotations which can be used for constructing impossible differentials. We show that Ascon's S-box contains 35 undisturbed bits and we use them to construct 4 and 5-round truncated, impossible, and improbable differential distinguishers. Our results include practical 4-round truncated, impossible, and improbable differential attacks on Ascon. Our best attacks using these techniques break 5 out of 12 rounds. These are the first successful truncated, impossible, and improbable differential attacks on the reduced-round Ascon.

Subject Keywords

ASCON, Truncated differential, Impossible differential, Improbable differential, Undisturbed bits

URI

https://hdl.handle.net/11511/32475

DOI

https://doi.org/10.5220/0005689903250332

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Graduate School of Informatics, Conference / Seminar

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Citation Formats

C. Tezcan, “Truncated Impossible and Improbable Differential Analysis of ASCON,” 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32475.