Unverified60% confidenceSolutionExact time
After migrating from AES-128 to AES-256, the optimal complexity achievable by Grover's algorithm is 2^128, which is why AES-256 is widely regarded as quantum-resistant.
2
Sources
60%
Confidence
Long-term
Relevance
7/11/2026
First Seen
Sources
Can Quantum Computers Break 128-bit Symmetric Keys? Analyzing the Real Threat
redditr/programming7/10/2026
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