Here’s a postcard that was sent from the Isle of Wight to London in 1905. Can a reader decipher it?

A workshop at HistoCrypt was dedicated to codes and nomenclators – for centuries the most popular kind of encryption. One of the topics discussed was a consistent terminology. Here is my suggestion. Perhaps, my readers can help to improve it.

The movie “Wanted” (starring Angelina Jolie and Morgan Freeman) contains a steganographic message. Can a reader decipher it?

Last year I reported on an encrypted inscription on a cigaret case from 1909. Though it looks like a simple substitution cryptogram that can be broken without much effort, it is still unsolved.

At the HistoCrypt 2018 I presented a poster about an analysis of the Dorabella Cryptogram. Here are the details of this work.

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.