# Researchers Run Textbook Quantum Cryptanalysis on Real IBM Hardware

Using Simon's algorithm on an IBM Heron-generation machine, the team recovered hidden periods in an Even-Mansour cipher structure, scaling from N=4 to N=10.

- Published: 2026-07-22T05:47:02.310Z
- Canonical: https://polylog.news/ai/2026-07-22/researchers-run-textbook-quantum-cryptanalysis-on-real-ibm-h
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [arXiv (cs.CR)](https://arxiv.org/abs/2607.18340)

A new arXiv preprint reports what the authors describe as genuine, uncompiled, textbook-faithful quantum cryptanalysis executed on real IBM quantum hardware, an ibmkingston machine of the Heron generation. Using Simon's algorithm, which fin…

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