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Challenge "Weakened Granit — Part 1"

Challenge "Weakened Granit — Part 1"  

  By: admin on Sept. 24, 2015, 7:30 a.m.

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and use an intentionally simplified version of GRANIT.

Part 1 is a ciphertext-only challenge for which both permutation keys are known.
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 Last edited by: admin on Oct. 31, 2021, 2:55 a.m., edited 2 times in total.

Is a matrix provided anyhow or ist this part of the challeng  

  By: Ossili on Sept. 24, 2015, 12:47 p.m.

Hallo MTC3,

is there any matrix provided or is this part of the challenge ?

Kind regards

Andreas

Re: Challenge  

  By: Scatha on Sept. 24, 2015, 2:25 p.m.

Hello Ossili,

finding the matrix is part of the challenge.
If we give you that information, there wouldn't be much to do for you anymore because that's the only point missing for decrypting the ciphertext. ;)

Best regards,
Scatha

Re: Challenge  

  By: Theofanidis on Sept. 25, 2015, 4:37 p.m.

Hello MTC3 team (Scatha) ,

I am certain that 3 minor errors occur at each starting email of each forum concerning the Weakened Granit - Part 1/2/3

While it is stated that

Post subject: Challenge "Weakened Granit — Part 1

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and contain an intentionally weakened version of GRANIT. Part 1 is a ciphertext-only challenge for which the second permutation key is known.

Post subject: Challenge "Weakened Granit — Part 2"

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and contain an intentionally weakened version of GRANIT. Part 2 is a ciphertext-only challenge for which both permutation keys are known.

Post subject: Challenge "Weakened Granit — Part 3"

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and contain an intentionally weakened version of GRANIT. Part 3 is a ciphertext-only challenge for which the first permutation key is known.

, the correct texts should be

Post subject: Challenge "Weakened Granit — Part 1

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and contain an intentionally weakened version of GRANIT. Part 1 is a ciphertext-only challenge for which both permutation keys are known.

Post subject: Challenge "Weakened Granit — Part 2"

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and contain an intentionally weakened version of GRANIT. Part 2 is a ciphertext-only challenge for which the first permutation key is known.

Post subject: Challenge "Weakened Granit — Part 3"

The challenges for the simplified GRANIT cipher, a method that can be done manually, serve as an exercise and contain an intentionally weakened version of GRANIT. Part 3 is a ciphertext-only challenge for which the second permutation key is known.

This conclusion is obvious if you compare the 3 pdf files. There R1 and R2, R1 and R2 are known in each part

The rest data seems OK

Best Regards
George Theofanidis

P.S. Keep up the great work you are doing.

Re: Challenge  

  By: Scatha on Sept. 26, 2015, 6:13 p.m.

Hello George,

thank you for your help, you are totally right regarding the starting descriptions. The order of the challenges has changed through the process of making them, but it seems I forgot to change the order of these texts as well. I'm sorry for that.
I will correct the texts right now.

Best regards,
Scatha


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