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Challenge "Hilly — Part 1"

Challenge "Hilly — Part 1"  

  By: admin on Jan. 25, 2017, 4:09 a.m.

Hilly is an improved version of the Hill cipher. This challenge consists of the decryption of a ciphertext by means of a given plaintext-ciphertext pair.
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 Last edited by: admin on Oct. 31, 2021, 2:55 a.m., edited 1 time in total.

Re: Challenge  

  By: Greko on Oct. 21, 2018, 12:46 p.m.

Dear MTC3 team,

In the description of the challenge it is mentioned that
Remark:
"To avoid any confusion: The order of the symbols in the substitution table T_A in this challenge is different from the order in the example in the description file."

The order in the description file is:

  • # & % $ + ? ! @ ˆ -

So for the challenge we should consider a random permutation of this as the starting point and then apply a shift according to the value of t in order to get the final substitution. Right?

If this is correct, then shouldn't T_A be considered as part of the key?

Best regards,
Greko

P.S. As I have already solved this challenge I have some other questions which I can not make here. Would it be possible to send my questions to a MTC3 team member?

Re: Challenge  

  By: be on Oct. 25, 2018, 6:29 p.m.

Would it be possible to send my questions to a MTC3 team member?

I sent you an email. Best regards, BE


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