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Title:
Beyond-Full-Round Integral Distinguisher of NIST Lightweight Cryptography Competition Finalist TinyJAMBU
Authors: Akram Khalesi, Zahra Ahmadian
Abstract:TinyJAMBU is one of the ten finalists of the NIST lightweight cryptography competition, announced in March 2021. It proposes a lightweight authenticated encryption scheme based on a lightweight 128-bit keyed permutation. TinyJAMBU supports three key lengths 128, 192, and 256 denoted by TinyJambu-128, TinyJambu192, and TinyJambu-256, respectively. The scheme as well as the permutation is well studied by the designers and third parties. The most relevant work to ours is the full-round zero-sum distinguisher under the known-key setting assumption published at Indocrypt 2022. In this work, we show that even without the known-key setting assumption, there are integral distinguishers not only for full-round versions of the permutations of TinyJambu-128 and TinyJambu-192 but also for round-increased versions of them up to 1273 rounds.
ePrint: https://eprint.iacr.org/2023/960
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