The first Enigma models were complex and expensive. Only when Enigma inventor Arthur Scherbius simplified the design of his machine it became practicable.

The greatest European crypto history event ever will take place in May 2017. So, save the date, consider handing in a paper, and come to Bratislava!

17th century polymath Daniel Schwenter invented a secret writing method based on musical notes. Can a reader solve a musical cryptogram encrypted in this system?

In the 1920s a woman named Grace Gull wrote a diary. For some text passages she used a secret code. Can a reader break it?

In 1906, an unknown person sent two beautiful postcards encrypted in a pigpen cipher to a man in Kent. Can a reader solve these two postcard cryptograms?