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AI cracks centuries-old ciphers in hours, raising mixed reactions

A 27-year-old AI engineer decrypted a 19th-century letter in hours, a task that had remained unsolved for over 200 years. The breakthrough highlights AI's growing role in historical research, though some experts remain cautious.

Published 16 October 2026 · ID 2026-10-16-ai-cracks-centuries-old-ciphers-in-hours-raising-mixed-reactions
AI cracks centuries-old ciphers in hours, raising mixed reactions

AI has cracked a centuries-old cipher in hours, a feat that would have taken scholars and hobbyists years to achieve. The breakthrough, achieved by a 27-year-old AI engineer named Carter Church, involved deciphering a 19th-century letter from 1809 that detailed French and allied troop positions during wartime. This event marks a significant shift in how historical documents are analyzed, with AI offering new tools for non-specialists to unlock long-buried secrets.

The use of AI in codebreaking is not new, but the speed and accuracy with which it can now process historical ciphers are notable. Church, who works at a US cybersecurity firm, used OpenAI's GPT-6 Astra model to decode the message, which had been ignored in an online academic archive for years. His success has sparked interest in how AI can be applied to other historical texts that have previously been inaccessible to non-experts.

The AI's ability to recognize characters with an accuracy rate of between 88 and 94 percent has enabled researchers to uncover details about historical events that were previously obscured. Historian Julie Claustre, who leads the e-NDP project, noted that AI brings persistence to the table, allowing for the decryption of ciphers that might otherwise remain unsolved. This has opened new avenues for historical research, though some experts remain cautious about the implications.

The rise of AI in codebreaking has sparked mixed reactions. While some see it as a turning point for historical research, others are concerned about the potential for overreliance on AI and the displacement of traditional methods. Experts warn that while AI can process vast amounts of data quickly, it may lack the nuanced understanding that human scholars bring to historical analysis. This has led to calls for a balanced approach that combines AI's efficiency with human expertise.

As AI continues to advance, its role in historical research is likely to expand, raising questions about the future of traditional scholarship. While some view AI as a tool that can democratize access to historical knowledge, others caution that it may also lead to the devaluation of human expertise. The long-term impact of AI on historical research remains to be seen, but its potential to unlock new insights is clear.

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