MysteryTwister C3
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Level II Challenges (135)

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

ORYX Stream Cipher — Part 4a

[stamp-15] - 11 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 20:37
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#11) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 1433 (190214) 2014-04-28 08:48:57
Kurt Gebauer (Yokozuna) 1330 (177433) 2014-05-15 20:49:07
S Combes (jerva) 1165 (99132) 2015-02-17 19:53:47
Forrest Gump (Polyphem) 1142 (38763) 2015-09-21 20:33:17
#5 Julia Bernotat (El Greco ) 1134 (81129) 2016-01-15 23:31:32
#6 Alain (Integral) 1132 (207924) 2016-02-27 18:22:17
#7 Javantea (Javantea) 1119 (40816) 2016-12-10 17:57:23
#8 Nicolas (nicosPavlov) 1118 (151166) 2017-01-04 09:11:50
#9 George Lasry (george4096) 1113 (302230) 2017-06-26 20:18:25
#10 D3d4lu5 (D3d4lu5) 1112 (299709) 2017-08-12 06:29:53
#11 Michael (FoM) 1101 (38953) 2019-03-11 23:55:56
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   +++    [10:56 - 22.11.2019] silva solved the Level II challenge 'Polyphonic Substitution Cipher — Part 1'    +++    [10:31 - 22.11.2019] Wolkenwolf solved the Level I challenge 'Number Sequence — Part 4'    +++    [23:07 - 21.11.2019] Wolkenwolf solved the Level I challenge 'Number Sequence — Part 2'    +++    [19:11 - 21.11.2019] Wolkenwolf solved the Level I challenge 'Original Caesar Cipher'    +++    [19:08 - 21.11.2019] Wolkenwolf solved the Level I challenge 'A hidden word'    +++