Quantum Cryptanalysis on Real Hardware: Pushing Symmetric-Structure Key Recovery Beyond the Published Frontier
Blog post from Hugging Face
Researchers have conducted a study using IBM's quantum hardware to recover the secret keys of two symmetric-cipher structures, Even-Mansour and 3-round Feistel constructions, scaling beyond previously published capabilities. The experiment, performed on the ibm_kingston quantum processor, demonstrated the application of Simon's algorithm to recover keys for Even-Mansour constructions with secret sizes ranging from N=5 to N=10 and 3-round Feistel constructions with block sizes 6 and 8. Despite achieving record hardware scale, the researchers emphasize that this does not represent a practical quantum speedup, as the results still align with classical computational limits, highlighting the challenges posed by current noisy quantum hardware. The study serves as a proof-of-concept, illustrating the potential for quantum attacks on symmetric ciphers and marking a significant step forward in practical quantum cryptanalysis, all while maintaining transparency about the experiment's limitations and scope.
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