Challenge "Double-Column Transposition/Granit — Part 2"  

  By: admin on July 1, 2015, 6:21 p.m.

This challenge series is about the GRANIT cipher, a method that can be done manually. It has been used for instance by the former GDR spy Günter Guillaume till about 1960.

Part 1, 2 and 3 of this series use the same keyword for generating the key matrix, but different permutation keys. This part has a ciphertext-only challenge and the ciphertext has 110 characters.

 Last edited by: admin on Oct. 31, 2021, 2:55 a.m., edited 1 time in total.

Re: Challenge  

  By: Scatha on July 6, 2015, 5:32 p.m.


the MTC3 team likes to ask people working at the GRANIT challenges to share with us (Python or C or Java, preferable Python) code they developed and which implements the whole process, gets a code book and the other parameters as input, and does ciphering and deciphering.
We also would like to share the code with everyone within MTC3.

Best regards,



falls Sie im Zuge Ihrer Arbeit an GRANIT einen Code entwickeln, der das Verfahren implementiert und als Eingabe ein Codebuch und die anderen Parameter enthält (in Python oder C oder Java, vorzugsweise Python), würde sich das MTC3-Team sehr freuen, wenn Sie uns den Quellcode zukommen lassen würden.
Wir würden den Quellcode dann gerne auch im MTC3 allen zur Verfügung stellen.

Beste Grüße,

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