# ChatGPT-6 Astra cracks 1941 Enigma message in two days, Crypto Cellar reports

Digest AI · Generative AI & Models · published 2026-09-26T10:00:00Z

Canonical: https://digestai.news/story/chatgpt-6-astra-cracks-1941-enigma-message-in-two-days-crypto-cellar-r

## Summary

Researchers at Crypto Cellar say ChatGPT-6 Astra decrypted an unsolved German Army Enigma transmission from July 10, 1941, known as the MVUEH message, in just two days. The 82-letter cipher was posted online in 2005 as challenge Nr. 172 and had resisted human cryptanalysts for years. According to the report, Astra selected the target itself, hypothesized a link to another message (Nr. 173, SIPVX), guessed the repeated plaintext "ROSENOW ROSENOW," and wrote its own Python and C++ Enigma simulator and Bombe code to test the hypothesis. The decrypted German text reads "BTTE UM ANGABE DES MARSQWEGES X BEFINDE MIQ IN X ROSENOW ROSENOW X SOFORT FUNKANTWORT X WASCHBBSCH," roughly translating to a request for march route and position at Rosenow with a demand for immediate radio reply. Researchers note the original message contained a spelling error that would have hindered traditional decryption. Crypto Cellar says it is still analyzing Astra's logs to understand the exact reasoning path. Last week, the same model reportedly cracked a 108-year-old WWI ADFGVX cipher.

## Key points

- ChatGPT-6 Astra decrypted the 1941 MVUEH Enigma message in two days, Crypto Cellar reports
- The model chose the target, wrote simulator and Bombe code, and used a "ROSENOW ROSENOW" plaintext guess
- Decrypted text reveals a German Army position report to the SS-Totenkopf Division

## Why it matters

Shows an LLM autonomously designing cryptanalysis tools and solving a historic cipher that resisted human experts for decades, suggesting new capabilities for code-breaking and historical research.

## Sources

1. [ChatGPT-6 Astra cracks 1941 Enigma-coded message in two days](https://tomshardware.com/tech-industry/artificial-intelligence/chatgpt-6-astra-cracks-1941-enigma-coded-message-in-two-days-autonomous-ai-coded-its-own-simulator-to-crack-code-that-was-unsolved-since-it-was-shared-online-back-in-2005) (Tom's Hardware, 2026-09-26)

Part of the developing story: [AI Uncovers Century Old War Cipher](https://digestai.news/thread/chatgpt-6-astra-decodes-108-year-old-wwi-german-cipher) (3 stories)

## Cite

Digest AI, "ChatGPT-6 Astra cracks 1941 Enigma message in two days, Crypto Cellar reports", 26 September 2026, https://digestai.news/story/chatgpt-6-astra-cracks-1941-enigma-message-in-two-days-crypto-cellar-r

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