MysteryTwister C3
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Level III Challenges (59)

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

ElsieFour — Part 1

[rotthaler-01] - 1 user already solved this challenge.
 
 
 

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-plaintext challenge which provides 2 messages that were encrypted with the same key.
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Published on: 2017-10-03 06:37
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#1) Achieved points (Global score) y-m-d - h:m:s

S Combes (jerva) 14436 (96368) 2018-06-18 22:14:19
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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'    +++