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GPT-6 Astra Breaks an Old Enigma Message

Schneier on Security
· September 22, 2026

AI summary

A GPT-6 Astra system has successfully broken an old Enigma message on its own. The system was directed to attempt to break unbroken Enigma messages published on a research website, and it selected message Nr. 172, MVUEH, as the most promising to crack. GPT-6 Astra also suspected a connection between the plaintext of message Nr. 173, SIPVX, and the unbroken MVUEH message. The system tried various approaches before focusing on a specific method to break the message. The breakthrough was achieved without human intervention, aside from initial guidance to attempt the break. The achievement demonstrates the capabilities of the GPT-6 Astra system in codebreaking.

Read the full article at Schneier on Securitywww.schneier.com/blog/archives/2026/09/gpt-6-astra-breaks-an-old-enigma-message.html

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