MysteryTwister C3
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Level III Challenges (74)

Page 4 of the 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 (253196) 2018-10-29 13:09:48
D3d4lu5 (D3d4lu5) 13586 (363488) 2021-01-04 19:14:20
Eugene (lim0n) 13512 (193160) 2021-07-20 12:27:20
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Handycipher — Part 9

[kallick-23] - 3 users already solved this challenge, 1 is working on it.
 
 
 

Handycipher is a newly created cipher designed to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. Part 9 is the same as Part 6, but uses an improved version of the cipher. It is a ciphertext-only challenge.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-01-21 22:17
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#3) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 14906 (399565) 2017-05-31 11:00:46
Michael Möller (michaelm) 14129 (253196) 2018-03-26 21:50:27
D3d4lu5 (D3d4lu5) 13830 (363488) 2019-01-26 17:57:14
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Handycipher — Part 8

[kallick-22] - 3 users already solved this challenge, 1 is working on it.
 
 
 

Handycipher is a newly created cipher designed to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. Part 8 is the same as Part 5, but uses an improved version of the cipher. You are given the ciphertext and 229 letters occuring at an unknown location in the plaintext.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-01-21 22:14
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#3) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 14917 (399565) 2017-05-28 23:32:02
Michael Möller (michaelm) 14117 (253196) 2018-04-04 18:16:20
D3d4lu5 (D3d4lu5) 13830 (363488) 2019-01-26 09:32:09
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Handycipher — Part 7

[kallick-21] - 2 users already solved this challenge, 1 is working on it.
 
 
 

Handycipher is a newly created cipher designed to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. Part 7 is the same as Part 4, but uses an improved version of the cipher. You are given the ciphertext and the first 229 letters of the plaintext.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-01-21 22:11
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#2) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 14917 (399565) 2017-05-28 23:43:15
D3d4lu5 (D3d4lu5) 13830 (363488) 2019-01-26 07:53:23
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Extended Handycipher — Part 6

[kallick-17] - 2 users already solved this challenge.
 
 
 

Extended Handycipher is an enhancement of Handycipher. Part 6 is the same as Part 3, but uses an improved version of the cipher. You are given two encryptions of the plaintext generated with the same key. It is ciphertext-only.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2016-06-28 20:06
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#2) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 14274 (399565) 2017-05-30 15:01:05
D3d4lu5 (D3d4lu5) 13701 (363488) 2019-01-28 18:39:51
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   +++    [01:47 - 02.08.2021] jerva solved the Level II challenge 'SIGABA CSP-2900 — Part 1'    +++    [00:40 - 02.08.2021] mochiorochi solved the Level I challenge 'Beaver Code'    +++    [22:51 - 01.08.2021] mochiorochi solved the Level I challenge 'A hidden word'    +++    [22:46 - 01.08.2021] mochiorochi solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [22:05 - 01.08.2021] mochiorochi solved the Level I challenge 'Letter to the Templars — Part 2'    +++