MysteryTwister C3
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Level III Challenges (74)

Page 6 of the challenges in Level III, ordered by date posted (the most recent appear first).

Spirale — Part 4

[allard-04] - 0 users already solved this challenge.
 
 
 

Spirale is a OTP cipher designed to be simply performed by hand.
Part 4 is a ciphertext-only challenge with a 485-letter ciphertext.
Unlike the other three parts of this series, this one uses four new random keys.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2015-08-23 19:11
Maximum number of attempts for this challenge: 15

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Handycipher — Part 3

[kallick-03] - 6 users already solved this challenge, 4 are working on it.
 
 
 

Handycipher is a newly designed cipher to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. You got only the ciphertext of the 993-character plaintext.
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Published on: 2015-03-03 23:40
Maximum number of attempts for this challenge: 15

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Rank User (#6) Achieved points (Global score) y-m-d - h:m:s

Alain (Integral) 15093 (207924) 2015-06-12 19:31:53
Michael Möller (michaelm) 14592 (253196) 2015-09-23 19:08:45
Em Doulgerakis (Greko) 13977 (193799) 2016-09-13 10:59:28
George Lasry (george4096) 13775 (399565) 2017-05-27 02:00:58
#5 Nicolas (nicosPavlov) 13640 (257791) 2018-01-31 14:46:27
#6 D3d4lu5 (D3d4lu5) 13529 (363488) 2018-11-01 21:36:05
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ORYX Stream Cipher — Part 4c

[stamp-17] - 0 users already solved this challenge, 1 is working on it.
 
 
 

The ORYX stream cipher consists of three 32-bit LFSRs X, A, B which are shifted differently depending on some bits in the LFSR X. The key stream is a combination of the highest 8 bits of each of the three LFSRs. It is neither feasible nor necessary to search the whole 96-bit key space, there are more efficient methods!
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2014-04-14 20:39
Maximum number of attempts for this challenge: 15

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ORYX Stream Cipher — Part 4b

[stamp-16] - 2 users already solved this challenge.
 
 
 

The ORYX stream cipher consists of three 32-bit LFSRs X, A, B which are shifted differently depending on some bits in the LFSR X. The key stream is a combination of the highest 8 bits of each of the three LFSRs. It is neither feasible nor necessary to search the whole 96-bit key space, there are more efficient methods!
Read more...

Click here to get to the corresponding forum topic to share your opinion.
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2014-04-14 20:38
Maximum number of attempts for this challenge: 15

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

Scombes (jerva) 14283 (266541) 2015-03-10 22:57:57
George Lasry (george4096) 13594 (399565) 2017-06-27 11:31:13
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Double Column Transposition Reloaded — Part 3

[wacker-10] - 0 users already solved this challenge.
 
 
 

The double columnar transposition is considered to be one of the best manual encryption systems. This sequence considers vulnerabilities that have been used to solve the corresponding level X challenge. The three challenges of the sequence have an increasing difficulty. In the third part a German plaintext has been encrypted with random keys.
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-12-11 20:11
Maximum number of attempts for this challenge: 15

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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'    +++