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Re: Challenge "Alberti Challenge - Part 2"

 On May 27, 2022, 10:46 p.m.

Very nice challenge.

One comment: Although I solved the challenge (and found the underlying plaintext, through a combination of cryptanalysis and detective w…

Re: Challenge "Substitution Cipher with Non-Prefix Codes"

 On Jan. 5, 2022, 7:52 p.m.


I am trying to solve this very interesting challenge, with a couple of new ideas, and an interesting vulerability, which I am happy to share (privately)…

Re: Challenge

 On July 16, 2019, 8:10 a.m.

It is relevant in order to make sure that you have the correct key, by checking that the decrypted text is fully correct, and this is not a nearby key, that wo…

Re: Challenge

 On July 15, 2019, 11:36 p.m.

Make sure the plaintext is clean and correct.

As mentioned in the challenge PDF, all the original plaintexts are from Shakespeare, and if you have an appro…

Re: Challenge

 On July 15, 2019, 9:18 p.m.

I double checked, and with the full key including the correct wheel positions (those that are unknown), the cipher decrypts correctly with the provided simulat…

Re: Challenge

 On May 10, 2019, 10:04 p.m.

For those of you who tried already and the answer was not accepted, you may try again, as the ciphertext is now correct (it was wrong previously).

Re: Challenge

 On Sept. 4, 2015, 8:01 p.m.

Granit is a safer cipher than the regular double-transposition cipher, which requires at least 500-600 for having any chance of being solved ciphertext-only (I…

Re: Challenge

 On May 23, 2014, 6:19 p.m.

As usual, Bart is correct!.

Indeed, there is a mistake in the explanation (but fortunately not in the challenge itself):

The example should be:


Re: Challenge

 On May 13, 2014, 12:54 p.m.


You are right and thank you for catching the error.

This is the correct crib


Re: Challenge

 On March 31, 2014, 5:37 p.m.

Hi Luis

Many thanks for your exciting challenges and your kind clarifications.

In fact I already solved #2 by chance, partially manually.
I can tell yo…

Re: Challenge

 On March 30, 2014, 10:08 p.m.

This is a message for the author.

I just want to make sure I fully understand the challenge:

1) Is the homophone table known or unknown?
2) Is the homo…

Re: Challenge

 On Dec. 19, 2013, 2:09 a.m.

Hi Victor

Based on research recently done (eventually leading to the solution of the original Double Transposition Challenge X), we can say the following: …

Re: Challenge

 On Aug. 25, 2013, 10:36 a.m.

Is the friend german? or does he writes in English? I should know since he is my friend :-)

The previous messages were in English but the hint says:


Re: Challenge

 On Aug. 25, 2013, 12:46 a.m.

Just finished this challenge, this was great fun. I tried many approaches, and the solution came from a unexpected direction…. Of course, it helps to have such…

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