Regular readers of my publications may remember that I have written several times about the murder of eleven-year-old Carlie Brucia. This case also has a cryptologic angle.

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

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

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

At the HistoCrypt 2026, I came across an encrypted document, which was exhibited by French radio history expert Didier Clarençon.