MysteryTwister C3

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New ElsieFour challenges available!

There are two new challenges that use the cipher LC4. In adition, new Python code is provided that contains a lot of new functions. You can find the code in the additional zip archives of all ElsieFour challenges.

The "Advent Challenge — Part 4" can be used as an introduction to ElsieFour.
Subsequently you should continue with the "Weakened ElsieFour" challenges part 1 to 3, which use a weakened version of the LC4 cipher. Finally "ElsieFour — Part 1" is waiting for you.

Enjoy the dissolving!

Advent Challenges

The Advent season should be a time of pleasant anticipation of Christmas. But for many people it is a frantically busy time — buying presents, planning, cooking, baking...
The protagonists of the Advent challenges also fight with their pre-Christmas problems. Are you able to help them und sweeten their pre-Christmas period?

The Advent challenges for the whole family are constructed easily, so that you can solve them without much previous knowledge.
In the weeks until Christmas there will be four new Advent challenges. Enjoy the dissolving!

Article about solving the Double-Transposition Challenge in Cryptologia

A level X challenge in MysteryTwister C3 by Klaus Schmeh using the double-column transposition cipher withstood a long time against cryptanalysis efforts. Nevertheless, it was solved in November 2013 by George Lasry.
The according attack against the double-column transposition cipher was just described in the journal Cryptologia and is now implemented in CrypTool 2, based on the method presented in the article "Solving the Double Transposition Challenge with a Divide And Conquer Approach", Cryptologia, Volume 38, Issue 3 by G. Lasry, N. Kopal and A. Wacker.
Three new double-column transposition cipher challenges (level III) have been published, which don't contain the weaknesses of the old challenge:
as well as a series of level II challenges for doing some exercise in that area:
CrypTool 2 (from June 25th, 2014) contains a demonstration of the algorithm how to solve the old double-column transposition from Klaus Schmeh.
You can find the according template in the Startcenter below the structure Cryptanalysis / Classical under the following name: "Dictionary attack on the Double Columnar Transposition Cipher".

The CODEBREAKERS.EU cryptology game — 4th edition

On June 1st, 2015 begins a "fantastic game" starting with the 1st of six tasks on the Enigma level.
The material to be studied is published twice a week, but the time in which you work out the final tasks matters the most.
The game on this level lasts till June 19th. Hints, time bonuses and "cryptologic bombs" help you to go ahead.

If you don’t know much about cryptology or cryptography and you are afraid you won’t do fine at the Enigma level, you can get to know some less complicated cryptological issues and practice your skills by playing the basic or advanced levels of our game.

"During the game everyone can find out what methods were used to beat Enigma as well as try to break messages encoded with the famous machine cipher. Enigma, a cipher machine considered unbreakable, was defeated by three brilliant mathematicians. Now, together with other adventurers from around the world, you have a chance to become an Enigma codebreaker."

To participate just register as a 3-person team at

MysteryTwister C3 now on Joomla! 1.7

MysteryTwister C3 has just moved from Joomla 1.5 to Joomla 1.7. Although 1.7 is out there now for a while, an upgrade is a complex and risky process as Joomla 1.7 is fundamentally different than Joomla 1.5.

Still we have made it and the system is fully up and running. Should you encounter any issues, please let us know under This email address is being protected from spambots. You need JavaScript enabled to view it..

powered by the CrypTool project  CrypTool


   +++    [07:08 - 19.09.2019] Bart13 solved the Level II challenge 'Hilly — Part 1'    +++    [23:59 - 18.09.2019] Byqq!T3qmxxZfRir solved the Level I challenge 'Number Sequence'    +++    [14:21 - 18.09.2019] h4rdl0ck solved the Level I challenge 'Factorization Cipher — Part 1'    +++    [14:15 - 18.09.2019] lim0n solved the Level I challenge 'Image Noise'    +++    [07:21 - 18.09.2019] h4rdl0ck solved the Level II challenge 'Cracking SHA1-Hashed Passwords'    +++