Right now, one cryptanalytic breakthrough is following another. The autumn of 2026 will undoubtedly go down in the history of cryptology. Thanks to AI-assisted methods, cryptographic cold cases that have resisted solution for decades are suddenly being cracked one after another.

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For the past few weeks, I have been working with several colleagues on a new cartoon series for my employer called Evi & Den.

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It is incredible. Yet another Top-50 crypto puzzle has been cracked with the help of AI.

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Christopher Love (1618–1651) was a Welsh Presbyterian minister and political activist who lived through the turbulent years of the English Civil War. After becoming involved in secret negotiations with the exiled Stuart court, he was convicted of treason and beheaded on Tower Hill in London on 22 August 1651.

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I have already mentioned on this blog that September 2026 is likely to go down in the history of codebreaking. Over the past few weeks, several long-unsolved cryptograms have been deciphered with the help of artificial intelligence.

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September 2026 will definitely go down in the history of codebreaking. Never before have so many unsolved cryptograms been deciphered in such a short period of time. The culprit, of course, is AI.

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Artificial intelligence is currently enjoying a remarkable run in the world of cryptanalysis. Hardly a week goes by without a new claim that an old cipher has been solved with the help of an AI model. Unfortunately, not every one of these announcements withstands closer scrutiny.

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Back in the days of my former Cipherbrain blog, I maintained a list of the 50 most important unsolved cryptograms. Several have been solved since then.

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Blog reader John Haas from Austria has drawn my attention to today’s topic.

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Blog reader Brent Lakes kindly informed me about an interesting unsolved crypto mystery. It appears on the final page of a book about the CIA.

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