Challenge "Weakened ElsieFour — Part 1"  

  By: admin on April 28, 2018, 4:29 p.m.

The challenges for the weakened ElsieFour serve as an exercise and use an intentionally weakened version of LC4. ElsieFour combines ideas of modern RC4 stream cipher, historical Playfair cipher and plaintext-dependent keystreams. It can be computed manually. Part 1 is a partly-known key challenge which provides the first 12 characters of the key.

Re: Challenge  

  By: AnLeRo 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 appear at any part of the plaintext
b. Symbol # appears only at the last section of the plaintext in front of the signature
c. Symbol _ does not appear as the first character
d. length of the first 3 words: 7-2-7

I hope this helps,

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