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Did anyone notice that Josse's way of mixing the alphabet is the same one used by Wheatstone? It must have been a popular method at the time.

Edit: except for…

I am so embarrased. Please disregard everything. My email wasn't being forwarded. All the notifications are there on the other account. So sorry, and thank you.

I did as you instructed. I found that I was already subscribed for new challenges. But I "saved changes" anyway.

The Josse 2 challege has appeared on the webs…

Hello, everyone.

I did not receive an email to let me know that this new challenge had been posted. I thought I was subscribed to the relevant things, but per…

Thank you both for replying. I think it is working, but so far the only evidence I have is the confirmation link, which was sent to the new address.

I seem to…

Hi,

How can I change my email address for my account at MTC3? There only seems to be a way to change my password.

Thank you.

Maybe there should be a part 6 with a scrambled table and short ciphertext.

My opinion is that this challenge should not be on level 3.

For those who come after us: From the challenge description, it is clear that the plaintext ends on a word boundary. You might think that you could save some t…

Can you tell me if the two masks undergo the same permutation? Thanks.

Anyone still monitoring this thread?

Anyway, I brute-forced it and still did not find a solution. Hm?

Is the permutation the same for both masks? Thank you.

I'm saying, e.g. for ciphertext 4, that there are 7! inner alphabets that will give the same solution.

BTW, in part 6 you say that more iterations don't increase security much. I would argue that for this cipher, they decrease security. With more iterations, the…

Why isn't this completely straightforward?