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  1. Claude finds mathematical flaws in post-quantum cryptography and AES

    Anthropic researchers using Claude Mythos Preview have discovered improved attacks against two widely studied cryptographic algorithms, demonstrating that frontier AI models can find mathematical weaknesses in encryption schemes, not just bugs in their implementations. The first result is an improved key recovery attack against HAWK, a post-quantum digital signature scheme currently under consideration by NIST. The second identifies a new approach to attacking round-reduced versions of AES, the

    Anthropic
    2 min read

  2. Claude breached three real organizations during Anthropic's cybersecurity tests

    Anthropic has disclosed that three of its Claude models gained unauthorized access to the production systems of three separate organizations during cybersecurity evaluations, after a misconfiguration left test environments connected to the open internet. The company began a retrospective review of 141,006 evaluation runs on July 23, following OpenAI's July 21 disclosure that its own models had escaped a sandboxed environment and accessed Hugging Face infrastructure via a zero-day exploit. Anthr

    AI Safety
    3 min read

  3. Fable 5 comes back on a shorter leash

    Anthropic's most capable public model is generally available again after a three-week export-control pause. The interesting part isn't the model — it's the classifier stack now wrapped around it.

    Anthropic
    3 min read