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Re: Challenge "Hill Cipher"

 On Oct. 24, 2022, 6:58 a.m.

Congrats on solving the challenge, madness! And you are right, you can't assume that the plaintext starts on a word boundary.

Re: Challenge "Alberti Challenge - Part 2"

 On Sept. 1, 2022, 7:04 a.m.

I get that. But I don't think it's relevant, the unicity distance is a function of the cipher system/cipher algorithm, not of the specific message. As I said i…

Re: Challenge "Alberti Challenge - Part 2"

 On Aug. 21, 2022, 12:09 p.m.

Not sure I can follow that logic. If, for example, you have a simple monoalphabetic substitution but the message does not contain alle available letters from t…

Re: Challenge "Alberti Challenge - Part 2"

 On May 28, 2022, 11:53 a.m.

Dear George,

thanks for the nice comment and congratulations to being the first to solve the challenge!

Seems I messed up the unicity distance calculation, s…

Re: Challenge "Keyshanc — Part 2"

 On May 5, 2022, 1:09 p.m.

The link in the challenge description is broken. This seems to be the correct link:…

Re: Challenge "Kaskade-S/T — Part 1"

 On April 15, 2022, 7:17 a.m.

Hi tryone144, thanks for fixing the verification process! I noticed that the challenge is now displayed as solved in my account. Happy Easter days to everybody!

Re: Challenge "ECDH-Key Exchange for Beginners"

 On April 14, 2022, 1:10 p.m.

I think I solved the affine cipher and got a solution which "looks right". It is rejected, however. Could anyone who already solved this check my solution? Th…

Re: Challenge "Kaskade-S/T — Part 1"

 On April 14, 2022, 1:09 p.m.

I easily found the key and have a 26key file which reproduces the plaintext when used with the provided Python code. However, like many others, I have trouble …

Re: Challenge "The SZ42 Challenge — Part 3"

 On March 15, 2022, 7:07 a.m.

To answer my own question: I accidentally swapped the two ciphers in my spreadsheet, so I submitted the wrong one's final 10 chars.

All good now ;-)

Re: Challenge "The SZ42 Challenge — Part 3"

 On March 14, 2022, 5:43 p.m.

My solution is rejected even though I'm pretty confident it is correct. I deciphered both cipher texts (including identifying the original sources of the plain…

Re: Challenge "The T52 Sturgeon Challenge — Part 1"

 On March 11, 2022, 7:54 a.m.

In the provided file 'T52 Functional Description', section 'Code Wheels', is an obvious error: it's stated 'those wheels have 47, 53, 59, 61, 64, 64, 67, 69, 7…

Re: Challenge "Cipher ID — Part 1"

 On March 4, 2022, 8:23 a.m.

My best submission has 498 out of 500 ciphers identified correctly, i.e. two characters are swapped compared to the correct result string (of course, my submit…

Re: Challenge "Lightweight Introduction to Lattices — Part 1"

 On Feb. 10, 2022, 12:59 p.m.

There are, by my count, 8 different symbols in the picture. I'm able to find a digit value for each of them satisfying the equilibrium condition on each vertex…

Re: Challenge "ADFGVX — Part 2"

 On Jan. 31, 2022, 1:25 p.m.

Besides the solution requested by the challenge's author there are several other solutions where the 6-letter substitution key does not represent a valid germa…

Re: Challenge "Playfair Encryption"

 On Dec. 3, 2021, 7:51 a.m.

Great choice for the quote and it's author!

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