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Re: Challenge "Modified Caesar Cipher"

 On Feb. 21, 2021, 8:24 p.m.

Using a proportional font which clearly distinguishes between the digit 0 and the character O or i and l would make absolute sense to me. The font "Hack" [1…

Re: Challenge

 On Feb. 22, 2019, 4:04 p.m.

Is it difficult to define required solution unambiguously? I did not even try to submit it.
At first only three surnames, then four surnames. I can confi…

Re: Challenge

 On Feb. 22, 2019, 3:59 p.m.

If I count the dogs correctly, then plaintext speaks about 9 different dogs. Two of the dogs have two different names. So there are 11 different names. One …

Re: Challenge

 On Jan. 23, 2019, 6:26 p.m.

Yes, the points and everything else should be correct now.

Re: Challenge

 On Jan. 9, 2019, 4:09 p.m.

The problem should be fixed now.

Re: Challenge

 On Jan. 8, 2019, 4:33 p.m.

We take care of the problem and correct the publishing date.

Sorry for the inconvenience!

Re: Challenge

 On Nov. 26, 2018, 10 p.m.

I have seen you solved the challenge in the meantime. Did you find out what "for given initial values" means and might it be interesting for other users?

Re: Challenge

 On Nov. 11, 2018, 8:22 p.m.


ich habe mir deine eingereichten Lösungen angesehen und deine erste historisch ermittelte Zahl ist richtig. Allerdings sollten keine Großbuchstaben m…

Re: Challenge

 On Sept. 24, 2018, 6:55 p.m.

Please feel free to send me a PM and I'll check your solution.

Re: Challenge

 On July 17, 2018, 3:52 p.m.

Hi plexor,

I'm sure 65535 is the right public exponent.

If you want me to check your primes, please feel free to send me a PM.

Best wishes,

Re: Challenge

 On July 8, 2018, 11:34 p.m.

As nobody has solved this challenge, yet, I would like to give some hints based on an exchange with one of our users:

a. Symbols 2,3,4,5,6,7,8,9 do not appe…

Re: Challenge

 On July 1, 2018, 11:15 p.m.

Please send me a PM and I'll check your solution.
Best regards, Anna

Re: Challenge

 On June 21, 2018, 2:31 p.m.

As you are given the first two and the last two digits of the credit card number, it might become obvious how to sort the positions as soon as you find the 8 v…

Re: Challenge

 On June 14, 2018, 8:45 p.m.


you should convert your "m" to base 128 first, then to binary and then to ascii.

I hope this helps,

Re: Challenge

 On June 14, 2018, 8:27 p.m.


I'll try to describe the problem: you are given an array with 80 values and you are looking for the 8 values that sum up to c. Each value is at a certai…

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