Blog reader Eugen Antal has found a beautiful chronogram in a Slovak archive. Can a reader decode it?
In the 19th century, a series of over 40 encrypted ads was published in a British newspaper. Can a reader decipher them?
Fort Meade, a United States Army installation known as the home of the NSA, has launched a new logo, which bears an encrypted message. Can a reader decipher it?
At the HistoCrypt in Mons I took a ten minutes video. Here it is.