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Level II Challenges (158)

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

ORYX Stream Cipher Part II
[stamp-02] - 47 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.
Read more...

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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 (#47) 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 (206965) 2010-11-08 14:54:26
#5 Thomas Gonda (TomG) 1235 (36291) 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 (169444) 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 (42945) 2011-12-20 16:04:06
#13 Bart den Hartog (Bart13) 1144 (148936) 2012-02-25 05:40:54
#14 Kurt Gebauer (Yokozuna) 1139 (282608) 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 (52356) 2013-01-20 02:16:27
#18 George (Theofanidis) 1123 (130187) 2013-03-12 00:17:58
#19 sukanya thakur (sthakur) 1122 (2244) 2013-03-22 23:09:29
#20 Luigi Tomelli (archstanton) 1120 (127538) 2013-05-31 12:51:45
#21 zahir mohsen moradi (ariobarzan) 1118 (99757) 2013-07-06 16:58:18
#22 Em Doulgerakis (Greko) 1118 (193799) 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 (207924) 2014-01-19 10:33:36
#26 Scombes (jerva) 1104 (242717) 2015-01-24 13:53:58
#27 Claude Vaillancourt (Cl3v3r) 1104 (44129) 2015-03-02 16:16:57
#28 E.T (Ertheb) 1102 (81809) 2015-06-23 21:07:09
#29 Javantea (Javantea) 1101 (40816) 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 (123666) 2015-12-13 10:14:49
#33 Julia Bernotat (El Greco ) 1099 (81129) 2016-01-03 15:54:10
#34 Karl Schutt (günter) 1098 (44374) 2016-03-19 18:49:03
#35 Robert (rm) 1097 (56475) 2016-04-20 15:36:24
#36 Rider (alrider) 1096 (7214) 2016-09-01 22:14:21
#37 Nicolas (nicosPavlov) 1095 (257791) 2016-11-01 13:24:34
#38 Kasia (kasia-tutej) 1092 (53366) 2017-06-22 13:42:41
#39 George Lasry (george4096) 1092 (399565) 2017-06-24 22:45:21
#40 D3d4lu5 (D3d4lu5) 1092 (363488) 2017-06-27 17:20:22
#41 Random Dude (rnd) 1088 (103645) 2018-09-14 01:06:06
#42 Michael (FoM) 1087 (57794) 2019-02-15 18:09:54
#43 Klaus (kumaus) 1087 (22017) 2019-04-12 17:31:41
#44 Eugene (lim0n) 1086 (193160) 2019-08-05 16:00:50
#45 Mike (RogueRamblers) 1085 (81614) 2019-11-08 01:56:10
#46 LurkNoi (Lurkrul) 1084 (19595) 2020-02-13 08:45:22
#47 Gerd Wilts (gerdw) 1084 (50634) 2020-02-22 09:25:34
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