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GPT-6 Astra Used in Researcher-Led Recovery of 1941 Enigma Message

September 25, 2026 at 13:25 EDT

Foundation Models
AI Agents

A researcher-led investigation says OpenAI's GPT-6 Astra helped recover an 82-character German Army Enigma message from July 10, 1941, using parallel specialist agents over a two-day study. The recovered message, labeled MVUEH in the CryptoCellar corpus, asks for a route of march, says the sender is in Rosenow, and requests an immediate radio reply.

Sept. 2026 · AI agents and cryptanalysis

AI-assisted Enigma recovery

GPT-6 Astra and parallel specialist agents helped a researcher recover MVUEH, an 82-letter German Army Enigma message from July 10, 1941, using a documented crib, search code, and verification checks.

reconstructed body letters

letters supplied by the ROSENOWROSENOW crib

43,016

declared search batches accounted for

~159Q

daily configurations before constraints

Known crib vs recovered text

14 letters

crib supplied

68 letters

surrounding text recovered

The guessed place name narrowed the search; the rest of the message and the independent header tested the candidate settings.

How the investigation moved

Source review

Record uncertain letters before search.

→

Crib search

Test ROSENOWROSENOW against possible settings.

→

Header check

Select HMF and RWD from body-equivalent settings.

Why it impressed developers

The workflow combined source comparison, simulator construction, search-code generation, and independent checking around one long-horizon task.

Why caution remains

The result depends on disclosed assumptions and a reconstructed body; it does not claim a new break of modern cryptography.

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