Niederlustadt-Letter-bar

How to tell your loved one where you are, if you are a soldier and not allowed to mention your whereabouts in your letters? A German soldier in the Second World War came up with a steganographic technique.

Paved-Steyr

A hidden message has been found on a paved square in Steyr, Austria. Now, the creator of this steganogram has to cover the costs for removing it.

KFC-Grave-2-bar

The animal rights organisation PETA has found interesting ways to protest against animal cruelty.

Simmons-Covert-bar

In the Cold War, US scientist Gus Simmons discovered a serious weakness in a cryptologic disarmament technology. His discovery initiated a new branch of IT security. Nevertheless, nobody seems to know how this weakness worked. The paper Simmons published about it doesn’t contain a detailed description. Does a reader know more?

Yellow-Dots-Buck-bar

Many color laser printers add tiny yellow dots to each page they print. These dots encode the printer serial number and additional information. A recently published research paper reveals new information about this secret code.

Maskenmann-NN-bar

In the intro of the German TV film “Im Namens meines Sohnes” a message is hidden. It is easy to solve.

Bauch-Code-Solved

US artist Andy Bauch hid messages in his Lego artworks. Blog reader Christian Baumann has now solved two of the codes.

Friedman-Grave-bar

The gravestone of William and Elizebeth Friedman in Washington, DC, bears a hidden message. A few days ago I had the chance to go on site and take a look at it. Here’s my report, including a video that shows Elonka Dunin explaining the code.

Shakespeare-Friedman-bar

William and Elizebeth Friedman, two of history’s greatest codebreakers, published a book dubunking the idea of hidden codes in the works of Shakespeare. However, the book itself contains a code. Can you find it?

Yardley-Stegano-Letter-bar

In July 1918 a British officer, who was imprisoned in Turkey, sent a letter to a girl in London. This letter contains a hidden message. Can somebody help me to find out what kind of code was used?