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Challenge "The LoRa Cipher: Logic Randomness — Part 1"

Challenge "The LoRa Cipher: Logic Randomness — Part 1"  

  By: admin on Feb. 19, 2020, 8:31 p.m.

LoRa calculates the ciphertext by using a logic expression as key. The ciphertext unusually contains large bitstreams too. Could you find the logic expression from a given ciphertext?
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Re: Challenge "The LoRa Cipher: Logic Randomness — Part 1"  

  By: snk on Feb. 20, 2020, 11:56 a.m.

Hello,

I solved the challenge and got the clear plaintext.
Still, my answer is not accepted.
Can anyone check my solution?

Thank you.

snk

Re: Challenge  

  By: madness on Feb. 20, 2020, 4:33 p.m.

I am in the same situation. I have the plaintext, but my answer is not accepted. Help?

Re: Challenge  

  By: madness on Feb. 20, 2020, 4:42 p.m.

@snk There are two keys that work. I found the other one, and it is accepted.

Re: Challenge  

  By: snk on Feb. 20, 2020, 5:33 p.m.

@madness It worked. Thank you..

Re: Challenge  

  By: argh on Feb. 20, 2020, 8:24 p.m.

Same problem here. I found both solutions, but none is accepted. Why do you have to make it so difficult to enter the key? Why the need to transform it to another format?

Re: Challenge  

  By: argh on Feb. 20, 2020, 8:41 p.m.

Ok, I found the problem. Small hint for all future solvers: the negation sign that is given in the PDFs is not the same as is used in the Python script and expected in the solution string!

Re: Challenge  

  By: be on Feb. 23, 2020, 7:34 p.m.

Thanks for the hints – we'll change that and accept both keys and both formats in the future. Sorry for any inconvenience.

Re: Challenge  

  By: tryone144 on Feb. 23, 2020, 10:42 p.m.

Thank you all for reporting your issues with the challenge.

We've changed the challenge to now accept both possible solutions as correct. Submissions in either "choices" or "mnemonic" form are acceptable. The fancy ’-quote should not cause any problems anymore.

Sorry for the confusion this has caused.

Re: Challenge  

  By: ExAstris on May 25, 2021, 9:12 p.m.

Hello all,

I got the plaintext by using a "choices" form as the -ks argument, but this "choices" form is not accepted as a valid solution.

I don't see how I could get the right plaintext with the wrong argument.

Could someone check my solution?

Thanks,

Eric

Re: Challenge  

  By: Theofanidis on May 26, 2021, 2 a.m.

I got the plaintext by using a "choices" form as the -ks argument, but this "choices" form is not accepted as a valid solution.

I don't see how I could get the right plaintext with the wrong argument.
Could someone check my solution?

Dear ExAstris (Eric)
Send me a PM with your findings, in order to check them
Also clarify to me what you mean with your question "I don't see how I could get the right plain text with the wrong argument", in the PM
Kind Regards,
George Theofanidis

Re: Challenge  

  By: ExAstris on May 26, 2021, 9:07 p.m.

Just FYI,

my solution was correct. It looks like there are at least 4 valid solutions.

Re: Challenge  

  By: Theofanidis on May 26, 2021, 10:02 p.m.

Just FYI,
my solution was correct. It looks like there are at least 4 valid solutions.

I checked all the possibilities and there are exactly 4 valid solutions.

MTC3 team has received an email from me and will make a modification so as to accept all valid solutions.

Sorry for any inconvenience.

Kind regards,
George Theofanidis

 Last edited by: Theofanidis on May 26, 2021, 10:07 p.m., edited 1 time in total.

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