Bogusław Wróbel, a journalist from Poland, came across two encrypted messages dating back to the Second World War during his research. The messages date to 1944 or early 1945 and likely originated from the highest echelons of the SS. The plaintext is in German.

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Today’s crypto mystery comes from Wenzel Grüß, one of the world’s leading mental calculators. At the end of this article, there is some more information about him. His abilities are truly impressive.

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The cryptogram presented today was brought to my attention by blog reader Alex Ulyanenkoff. It appears on a page of a notebook that its owner has presented on Facebook.

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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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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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James Madison (1751–1836), the fourth President of the United States, left behind an enormous documentary legacy.

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In his book The Agony Column Codes & Ciphers, codebreaker Tony Gaffney presents more than a thousand encrypted newspaper advertisements from Victorian England.

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A few weeks ago, the following document was shared on Reddit.

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Today, we are once again looking at a postcard – one that was kindly made available to me by Edmond Kern.

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