## Cryptography Engineer Filippo Valsorda Debunks Myth: AES 128 Remains Secure Against Quantum Threat
A persistent myth in cybersecurity circles—that the widely used AES 128 encryption is vulnerable to quantum computers—is being directly challenged by cryptography engineer Filippo Valsorda. He asserts that, contrary to popular superstition, AES 128 remains perfectly secure in a post-quantum world. This clarification comes amid growing industry and governmental focus on the existential threat quantum computing poses to other forms of encryption, particularly public-key cryptography.

The Advanced Encryption Standard (AES) 128, formally adopted by NIST in 2001, is the most widely used variant of the block cipher suite. It has no known cryptographic vulnerabilities in its 30-year history, making brute-force attacks the only theoretical method of breaking it. With 2^128 possible key combinations, a brute-force attempt using the entire Bitcoin mining network's resources as of 2026 would still take approximately 9 billion years. The core of Valsorda's argument hinges on the issue of parallelization; quantum computers do not provide the exponential speedup against symmetric encryption like AES that they do against asymmetric systems.

This technical stance carries significant implications for enterprise security planning and national standards. While agencies like NIST are urgently standardizing post-quantum cryptographic algorithms to replace vulnerable public-key systems, Valsorda's analysis suggests that foundational symmetric encryption standards may not require the same level of panic or immediate overhaul. The warning underscores a critical need for precise threat modeling, separating genuine quantum vulnerabilities from enduring security myths to avoid misallocating vast resources in the global cryptographic transition.
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- **Source**: Ars Technica
- **Sector**: The Lab
- **Tags**: encryption, quantum computing, cybersecurity, AES, NIST
- **Credibility**: unverified
- **Published**: 2026-04-21 15:22:47
- **ID**: 74469
- **URL**: https://whisperx.ai/en/intel/74469