Crowdsourced cryptanalysis mission


The Challenge is over.


After making several blind bids for historical office equipment sold online, we finally managed to hit pay-dirt with the latest auction. While we are still not exactly sure what the purpose of the apparatus has been, evidence indicates it has been used to secure communications; there is an engraving inside the device stating it has been approved for foreign use by the National Institute of Secrets and Technobabble. The label on the bottom of the device contains a stamp from Oberkommando des Ministeriums für alberne Gänge Chiffrierabteilung.

Hopefully you can help us uncover the secrets of the acquired technology. The mission, should you choose to accept it, is to participate in the crowdsourced cryptanalysis effort of the acquired machinery.

Operational information

The first person to enter all the correct SHA-ONEs will win a free ticket to tee two fifteen conference. In addition to this, the creators of the Challenge will select another winner among the next ten correct answers. The criteria for the other selection is the elegance of the answer. In short, you can win with both speed and style. Either way, the solution must include a detailed description of the methods and tools used.

If you want to see what elegance looks like – please check out the winning write-ups from previous years.

Rules of the Challenge

  • ONE – Anybody can participate, excluding the organizers and employees of the companies that made the challenge.
  • TWO – The answer must have a detailed description of the methods and tools used.
  • THREE – It is not allowed to publish the solution on public forums before the challenge is over.
  • FOUR – It is not allowed to modify or redistribute the challenge files.
  • FIVE – All rights are reserved.

Filename: t215-challenge.exe
Filesize: 655 360 bytes
SHA ONE: c20aa757d70911616301aa592d75b9ec77188935


All the cool stuff: Ludvig Strigeus, Rest: Timo Teräs, Tomi Tuominen