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Level II Challenges (107)

Page 1 of the challenges in Level II, ordered by date posted (the most recent appear first).

Weakened ElsieFour — Part 1

[rotthaler-07] - 0 users already solved this challenge, 1 is working on it.
 
 
 

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.
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Published on: 2018-04-28 16:29
Maximum number of attempts for this challenge: 15

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   +++    [21:55 - 17.07.2018] Sgt. Pepper solved the Level II challenge 'M-138 — Part 4'    +++    [19:54 - 17.07.2018] Sgt. Pepper solved the Level II challenge 'Monoalphabetic substitution with camouflage — Part 2'    +++    [19:15 - 17.07.2018] Cenlan solved the Level I challenge 'Grille Cipher'    +++    [18:28 - 17.07.2018] Sgt. Pepper solved the Level II challenge 'Monoalphabetic Substitution with Camouflage — Part 5'    +++    [17:14 - 17.07.2018] Cenlan solved the Level I challenge 'A hidden word'    +++