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Re: Challenge

 On Feb. 19, 2021, 11:20 a.m.

Hi Alex,
Yes, but it depends on how literally you mean with pen and paper.

I solved it without writing a program, but with Excel, several online …

Re: Challenge

 On Feb. 18, 2021, 7:42 p.m.

Now this was an especially fun one, but I wonder if someone actually solved this with pen & paper :-)


Re: Challenge

 On Feb. 17, 2021, 3:02 p.m.

One question: The challenge description says:

The plaintext of part 2 consists of 100 letters which means that each strip in the frame is used four times…

Re: Challenge "Modified Caesar Cipher"

 On Feb. 14, 2021, 10:12 a.m.

Indistinguishable characters "l" (small "L") and "I" (big "i") in the font used in PDF are another source of mistakes especially for users that solve the ch…

Re: [solved] Challenge

 On Feb. 10, 2021, 5:16 p.m.

OK, never mind, I just learned that the factorization method I'm using is magically calling up factordb - I was really wondering why it was that fast.

Re: [solved] Challenge

 On Feb. 10, 2021, 4:52 p.m.

Although it this challenge wouldn't give any points, I tried to factor it nonetheless and was surprised, that the factorization took less than 2 seconds (!) on…

Re: Discussing solved challenges

 On Feb. 5, 2021, 3:27 p.m.

Hi everyone,

I'm now here for a few weeks and had quite a lot of fun so far.

I'm also really interested in how people solved problems, exploring their m…

Re: Challenge

 On Feb. 4, 2021, 10:03 p.m.

OK, I really liked this one, but it has one small evil twist which led me in the wrong direction :-)

Thanks a lot,

Re: Challenge

 On Jan. 19, 2021, 12:38 p.m.

Just to get this straight, we're talking about a vanilla-flavoured Pigpen as described in the Wikipedia article:


Re: Challenge

 On Jan. 18, 2021, 6:41 p.m.

I felt like an alien trying to decipher the Arecibo message!
That was fun :-)

Re: Challenge

 On Jan. 18, 2021, 5:20 p.m.

Oh gosh, now my eyes hurt! :-)
Good one! :-)

Re: Challenge

 On Jan. 18, 2021, 3:50 p.m.

Alright, in the first 5 or 6 tries I did it wrong for problem 1 as I forgot that the Fib-sequence starts with 0,1,1 - not 1,1,2. Doh. it's even written in the …

Re: Challenge

 On Jan. 13, 2021, 5:20 p.m.

That was a fun one! I really enjoyed it :-)


Re: Challenge "Monoalphabetic substitution"

 On Jan. 10, 2021, 5:03 p.m.


ich glaube, alles richtig gemacht zu haben, aber keine Antwort wird akzeptiert.

  1. Habe das 'Keyword' gefunden, daraus ein Alphabet gebaut, und den …
Re: Challenge

 On Jan. 9, 2021, 1:47 p.m.

Hello everyone,

I'm new here and I just solved this challenge programmatically. Yes, you can determine the permutation for plaintexts of arbitrary lengths. …

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