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Level II Challenges (95)

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

ORYX Stream Cipher Part II

[stamp-02] - 39 users already solved this challenge, 3 are 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!

Hint: Enter the codeword in hex with non-capital letters and a leading zero.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#39) Achieved points (Global score) y-m-d - h:m:s

Nabb (Nabb) 1660 (13803) 2010-10-18 12:47:49
un known (unknown) 1547 (5466) 2010-10-20 22:49:54
Joachim Protze (joschi) 1523 (4877) 2010-10-21 14:54:25
Armin Krauss (argh) 1353 (153843) 2010-11-08 14:54:26
#5 Thomas Gonda (TomG) 1235 (33741) 2011-01-16 11:55:46
#6 Wolfgang Weisser (wowmyst) 1215 (33108) 2011-02-16 23:30:50
#7 J. M. (jomandi) 1168 (113270) 2011-08-03 19:17:18
#8 Viktor (Veselovský) 1163 (113116) 2011-08-30 02:58:06
#9 Seth Kintigh (DarkFibre) 1163 (79471) 2011-09-04 08:05:16
#10 Flip (Flip) 1161 (31107) 2011-09-14 10:32:16
#11 Jan Temme (JaT3) 1150 (11694) 2011-12-18 20:39:31
#12 Nobody (nobody) 1150 (40618) 2011-12-20 16:04:06
#13 Bart den Hartog (Bart13) 1144 (116412) 2012-02-25 05:40:54
#14 Kurt Gebauer (Yokozuna) 1139 (120839) 2012-04-28 12:41:41
#15 Fabian Hemmer (llan) 1126 (7842) 2012-12-12 21:01:37
#16 Tron (Tron) 1126 (7381) 2012-12-21 23:17:18
#17 Hans Peter (hanspeter) 1125 (48115) 2013-01-20 02:16:27
#18 George (Theofanidis) 1123 (88988) 2013-03-12 00:17:58
#19 sukanya thakur (sthakur) 1122 (2244) 2013-03-22 23:09:29
#20 Luigi Tomelli (archstanton) 1120 (95549) 2013-05-31 12:51:45
#21 zahir mohsen moradi (ariobarzan) 1118 (99757) 2013-07-06 16:58:18
#22 Em Doulgerakis (Greko) 1118 (109970) 2013-07-09 14:44:56
#23 Forrest Gump (Polyphem) 1114 (38763) 2013-11-15 00:49:01
#24 Francisco Moraes (fmoraes) 1114 (90044) 2013-11-27 18:44:56
#25 Alain (Integral) 1113 (198642) 2014-01-19 10:33:36
#26 S Combes (jerva) 1104 (77932) 2015-01-24 13:53:58
#27 Claude Vaillancourt (Cl3v3r) 1104 (38251) 2015-03-02 16:16:57
#28 E.T (Ertheb) 1102 (54872) 2015-06-23 21:07:09
#29 Javantea (Javantea) 1101 (38889) 2015-09-10 20:38:45
#30 Martin Härterich (HaeM) 1100 (15149) 2015-10-04 12:07:10
#31 Sean (Kavanaugh) 1099 (29143) 2015-12-05 23:37:14
#32 Alain Collignon (vexilla72) 1099 (51007) 2015-12-13 10:14:49
#33 Julia Bernotat (El Greco ) 1099 (81129) 2016-01-03 15:54:10
#34 Karl Schutt (günter) 1098 (34469) 2016-03-19 18:49:03
#35 Robert (rm) 1097 (56012) 2016-04-20 15:36:24
#36 Rider (alrider) 1096 (7214) 2016-09-01 22:14:21
#37 Nicolas (nicosPavlov) 1095 (70954) 2016-11-01 13:24:34
#38 Kasia (kasia-tutej) 1092 (25120) 2017-06-22 13:42:41
#39 george lasry (george4096) 1092 (216759) 2017-06-24 22:45:21
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   +++    [20:18 - 26.06.2017] george4096 solved the Level II challenge 'ORYX Stream Cipher — Part 4a'    +++    [19:43 - 26.06.2017] D3d4lu5 solved the Level I challenge 'Zodiac Cipher'    +++    [19:41 - 26.06.2017] D3d4lu5 solved the Level I challenge 'Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1'    +++    [21:32 - 25.06.2017] kasia-tutej solved the Level II challenge 'Brute-Force-Attack on Triple-DES with Reduced Key Space'    +++    [10:46 - 25.06.2017] kynguyenngoc solved the Level II challenge 'Cracking SHA1-Hashed Passwords'    +++