Twitter/X

@signulll (2026-07-28) claims “the fundamental principles upon which almost all…

2026-07-28 · 18:21 UTC ·@signulll ·1 min read

Brief

Author @signulll voiced alarm on 2026-07-28, claiming advances found with Anthropic's Claude threaten core cybersecurity by potentially breaking symmetric cryptography and exposing infrastructure. Anthropic says Claude Mythos Preview helped locate algorithmic weaknesses, while a community note limits the findings to HAWK (non-deployed) and a 7/10-round AES reduction, not full AES-128.

Why it matters

@signulll (2026-07-28) claims “the fundamental principles upon which almost all of cyber security... are rapidly breaking down,” warning that if a model can break symmetric cryptography then “every piece of infrastructure is basically an open lock.”

Key details

  • Anthropic published research titled "Discovering cryptographic weaknesses with Claude," stating Claude Mythos Preview helped researchers find weaknesses in cryptographic algorithms.
  • A community note clarifies the research found issues only in HAWK (a non-deployed candidate scheme) and a reduced AES variant (7 of 10 rounds); production infrastructure and full AES-128 remain unbroken.
Source evidence

oh my god.

the fundamental principles upon which almost all of cyber security, hell even some physical security itself is built are rapidly breaking down.

if this is true, & a model was able to find a way to break symmetric cryptography every piece of infrastructure is basically an open lock at this point.
Community note: Production infrastructure is not vulnerable to these findings. The research identifies weaknesses in HAWK, a non-deployed candidate scheme, and a reduced version of AES (7 of 10 rounds). The full AES-128 cipher used in modern software remains secure and unbroken. anthropic.com/research/disco…

Anthropic (@AnthropicAI)

New Anthropic research: Discovering cryptographic weaknesses with Claude.

Claude Mythos Preview has helped our researchers find weaknesses in cryptographic algorithms—the mathematical methods that are used to keep data private.

Read more: anthropic.com/research/disco…

Link

Discovering cryptographic weaknesses with Claude

Anthropic researchers find weaknesses in cryptographic algorithms with Claude Mythos Preview
anthropic.com

— https://nitter.net/AnthropicAI/status/2082153297670992134#m