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the claim

Quantum computers can break 256-bit AES symmetric encryption in practical time.

the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 7 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that quantum computers can break 256-bit AES symmetric encryption in practical time?

Unclear. Several peer-reviewed and reference sources indicate that quantum computers threaten public-key cryptography but that Grover's algorithm only halves the effective security of AES-256 to roughly 128 bits, so AES-256 is not practically broken; these sources partially address the claim rather than settling it outright.

Verdict: PARTIAL LEAN · 0 sources for, 7 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence against · 7
40-bit encryption
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40-bit encryption. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/40-bit_encryption

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More against · 6
Saturnin: a suite of lightweight symmetric algorithms for post-quantum security
2020
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Canteaut, A., Duval, S., Leurent, G., Naya-Plasencia, M., Perrin, L., Pornin, T., & Schrottenloher, A. (2020). Saturnin: a suite of lightweight symmetric algorithms for post-quantum security. doi.org. https://doi.org/10.13154/tosc.v2020.iS1.160-207

Maintaining Secure Level on Symmetric Encryption under Quantum Attack
2023
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Shiu, H., Yang, C., Tsai, Y., Lin, W., & Lai, C. (2023). Maintaining Secure Level on Symmetric Encryption under Quantum Attack. doi.org. https://doi.org/10.3390/app13116734

Design and implementation of an authenticated post-quantum session protocol using ML-KEM (Kyber), ML-DSA (Dilithium), and AES-256-GCM
2026
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Olushola, A. & Meenakshi, S. P. (2026). Design and implementation of an authenticated post-quantum session protocol using ML-KEM (Kyber), ML-DSA (Dilithium), and AES-256-GCM. doi.org. https://doi.org/10.3389/fphy.2025.1723966

Quantum computing
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Quantum computing. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Quantum_computing

Security Rests on Three Grounds, and a Quantum Computer Breaks Only One ── RSA at 2048 Bits Is Accelerated by 10^25.3, Yet Multiplying the Key Length by 8 Raises the Quantum Effort Only 512-fold ── What Holds No Information Cannot Be Computed by Any Machine ── [Paper 305]
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Security Rests on Three Grounds, and a Quantum Computer Breaks Only One ── RSA at 2048 Bits Is Accelerated by 10^25.3, Yet Multiplying the Key Length by 8 Raises the Quantum Effort Only 512-fold ── What Holds No Information Cannot Be Computed by Any Machine ── [Paper 305]. (n.d.). zenodo.org. https://zenodo.org/records/22172119

Accelerating Quantum-Secure Communications via DPU-Based Network Offloads
2026
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Accelerating Quantum-Secure Communications via DPU-Based Network Offloads. (2026). research.tue.nl. https://research.tue.nl/en/publications/fde095d5-805e-4fe2-9119-ce56506bc01e

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