MysteryTwister C3
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Level III Challenges (74)

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

ElsieFour — Part 1

[rotthaler-01] - 4 users already solved this challenge, 1 is working on it.
 
 
 

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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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-10-03 06:37
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#4) Achieved points (Global score) y-m-d - h:m:s

Scombes (jerva) 14436 (266541) 2018-06-18 22:14:19
Michael Möller (michaelm) 14182 (256593) 2018-10-29 13:09:48
D3d4lu5 (D3d4lu5) 13586 (363488) 2021-01-04 19:14:20
Eugene (lim0n) 13512 (195334) 2021-07-20 12:27:20
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   +++    [14:53 - 27.09.2021] jenniferdecastro solved the Level I challenge 'A hidden word'    +++    [14:28 - 27.09.2021] Mercer solved the Level II challenge 'Cracking SHA1-Hashed Passwords'    +++    [09:52 - 26.09.2021] CRYbaby solved the Level I challenge 'How do you become a big cryptographer?'    +++    [17:29 - 25.09.2021] gemmath solved the Level I challenge 'Letter to the Templars — Part 1'    +++    [17:22 - 25.09.2021] Surtees solved the Level I challenge 'Original Caesar Cipher'    +++