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Fast Side-Channel Key-Recovery Attack against Elephant Dumbo
Authors: Louis VialarAbstract:
In this paper, we present an efficient side-channel key recovery attack against Dumbo, the 160-bit variant of NIST lightweight cryptography contest candidate Elephant. We use Correlation Power Analysis to attack the first round of the Spongent permutation during the absorption of the first block of associated data. The full attack runs in about a minute on a common laptop and only requires around 30 power traces to recover the entire secret key on an ARM Cortex-M4 microcontroller clocked at 7.4MHz. This is, to the best of our knoweledge, the first attack of this type presented against Elephant.
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