MysteryTwister C3
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Level III Challenges (72)

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

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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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.
Click here to download the challenge.
Click here to download the additional file of the challenge.

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

S Combes (jerva) 14283 (218893) 2015-03-10 22:57:57
George Lasry (george4096) 13594 (372955) 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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Published on: 2013-12-11 20:11
Maximum number of attempts for this challenge: 15

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Double Column Transposition Reloaded — Part 2

[wacker-09] - 0 users already solved this challenge, 1 is working on it.
 
 
 

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 second part two interleaved English texts have been encrypted with random keys.
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Published on: 2013-12-11 20:11
Maximum number of attempts for this challenge: 15

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Double Column Transposition Reloaded — Part 1

[wacker-08] - 0 users already solved this challenge, 2 are working on it.
 
 
 

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 first part an English plaintext has been encrypted with keys derived from English sentences.
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Published on: 2013-12-11 20:09
Maximum number of attempts for this challenge: 15

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   +++    [00:18 - 16.04.2021] FoM solved the Level II challenge 'Unusual encryption using a diophantine equation'    +++    [00:03 - 16.04.2021] Ammonym solved the Level I challenge 'Advent-Challenge — Part 1'    +++    [18:44 - 15.04.2021] anonym404 solved the Level I challenge 'Find the right route — Part 2'    +++    [18:38 - 15.04.2021] sir5 solved the Level I challenge 'Modified Caesar Cipher'    +++    [06:25 - 15.04.2021] sir5 solved the Level I challenge 'Affine Codes / Modulo Arithmetic with N / Extended Euclid'    +++