MysteryTwister C3
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Level II Challenges (96)

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

ORYX Stream Cipher Part I

[stamp-01] - 72 users already solved this challenge, 8 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.
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 (#72) Achieved points (Global score) y-m-d - h:m:s

Nabb (Nabb) 1660 (13803) 2010-10-18 11:50:55
un known (unknown) 1576 (5466) 2010-10-20 00:14:52
Joachim Protze (joschi) 1547 (4877) 2010-10-21 12:55:53
Armin Krauss (argh) 1367 (155287) 2010-11-05 23:22:19
#5 Thomas Gonda (TomG) 1236 (33741) 2011-01-14 20:39:40
#6 Nobody (nobody) 1231 (40618) 2011-01-21 17:39:53
#7 Wolfgang Weisser (wowmyst) 1215 (33108) 2011-02-16 22:20:24
#8 Pramathesh (pramathesh5) 1200 (1200) 2011-03-24 03:29:46
#9 Foram (Patel) 1200 (1200) 2011-03-24 03:33:11
#10 kyprizel (kyprizel) 1188 (20795) 2011-05-01 18:17:20
#11 J. M. (jomandi) 1168 (113270) 2011-08-03 18:40:30
#12 Viktor (Veselovský) 1165 (113116) 2011-08-21 00:03:44
#13 Daniel Fretwell (fretty) 1165 (30107) 2011-08-22 00:54:26
#14 Seth Kintigh (DarkFibre) 1163 (79471) 2011-09-04 07:18:15
#15 Flip (Flip) 1162 (31107) 2011-09-10 16:59:44
#16 Anton Wendel (MoD) 1150 (5679) 2011-12-15 01:40:11
#17 unknown anonymous (s1op) 1150 (1150) 2011-12-16 00:46:38
#18 Friedrich Wiemer (asante) 1150 (5183) 2011-12-16 00:49:58
#19 Sk1w41k35 (Sk1w41k35) 1150 (1150) 2011-12-17 17:26:46
#20 Nicolas Golubovic (qll) 1150 (14919) 2011-12-18 12:58:28
#21 Jan Temme (JaT3) 1150 (11694) 2011-12-18 17:04:05
#22 h3po (h3po) 1150 (20433) 2011-12-18 21:28:01
#23 jacobian1729 (jacobian1729) 1144 (5584) 2012-02-16 17:44:54
#24 Bart den Hartog (Bart13) 1144 (116412) 2012-02-24 02:11:58
#25 Ashwin R (Ar) 1142 (1142) 2012-03-22 07:50:31
#26 Luigi Tomelli (archstanton) 1142 (95549) 2012-03-24 10:38:55
#27 Michel Van Caneghem (vancan) 1141 (49719) 2012-04-01 20:59:36
#28 Amit Balid (amitbalid) 1141 (1141) 2012-04-03 00:26:40
#29 Kurt Gebauer (Yokozuna) 1139 (120839) 2012-04-27 22:46:11
#30 Johannes T. (K2d) 1126 (1428) 2012-12-10 17:50:25
#31 David (pilz) 1126 (1126) 2012-12-11 23:41:57
#32 Fabian Hemmer (llan) 1126 (7842) 2012-12-12 20:17:13
#33 Bleh (bleh) 1126 (1126) 2012-12-17 01:57:44
#34 rokky rokksus (rokksus) 1126 (1126) 2012-12-17 02:15:15
#35 Tron (Tron) 1126 (7381) 2012-12-17 09:44:38
#36 Hans Peter (hanspeter) 1125 (48115) 2013-01-16 23:15:44
#37 George (Theofanidis) 1125 (88988) 2013-01-20 13:55:05
#38 Em Doulgerakis (Greko) 1123 (109970) 2013-02-16 21:28:26
#39 Michael Düll (akurei) 1123 (1123) 2013-02-27 17:32:12
#40 sukanya thakur (sthakur) 1122 (2244) 2013-03-22 23:01:45
#41 zahir mohsen moradi (ariobarzan) 1118 (99757) 2013-07-06 16:57:23
#42 Almut (problelmo) 1117 (45992) 2013-08-01 23:08:04
#43 Seth (cville) 1117 (1117) 2013-08-17 13:50:36
#44 chris_3stones (3stones) 1115 (34472) 2013-10-31 19:27:34
#45 Forrest Gump (Polyphem) 1114 (38763) 2013-11-09 02:32:23
#46 Deebiga Rajeswaran (deebiga) 1114 (1114) 2013-11-09 05:07:12
#47 aishwarya rastogi (aishwarya) 1114 (1114) 2013-11-09 05:18:51
#48 Francisco Moraes (fmoraes) 1114 (90044) 2013-11-26 15:34:47
#49 Alain (Integral) 1113 (198642) 2014-01-18 19:10:51
#50 Javantea (Javantea) 1109 (38889) 2014-05-24 19:40:23
#51 Robert (rm) 1106 (56012) 2014-11-25 21:14:44
#52 S Combes (jerva) 1104 (77932) 2015-01-20 21:32:49
#53 Claude Vaillancourt (Cl3v3r) 1104 (38251) 2015-03-01 23:18:47
#54 E.T (Ertheb) 1102 (54872) 2015-06-23 19:14:33
#55 Martin Härterich (HaeM) 1100 (15149) 2015-10-03 10:50:09
#56 Sean (Kavanaugh) 1099 (29143) 2015-12-05 23:39:32
#57 Alain Collignon (vexilla72) 1099 (51007) 2015-12-11 12:53:34
#58 Julia Bernotat (El Greco ) 1099 (81129) 2015-12-24 13:15:59
#59 Vikash (vikash72) 1098 (1098) 2016-03-19 07:20:02
#60 Karl Schutt (günter) 1098 (34469) 2016-03-19 15:49:34
#61 Swathi Nambiar (Swathi18) 1098 (1098) 2016-03-20 22:59:25
#62 Rider (alrider) 1096 (7214) 2016-08-30 21:11:36
#63 Nicolas (nicosPavlov) 1095 (71054) 2016-10-10 17:16:53
#64 digiter (digiter1) 1093 (2187) 2017-03-13 04:44:06
#65 bo (booooooooooooooo) 1093 (1193) 2017-03-13 07:17:23
#66 chris (c2) 1093 (51973) 2017-03-21 15:49:29
#67 Vasudha Venkatesh (vasu18) 1093 (2292) 2017-03-23 11:06:41
#68 Dominik M. (Sgt. Pepper) 1093 (43997) 2017-05-07 21:58:12
#69 Kasia (kasia-tutej) 1092 (27318) 2017-06-19 11:40:51
#70 george lasry (george4096) 1092 (281491) 2017-06-24 21:53:23
#71 D3d4lu5 (D3d4lu5) 1092 (57702) 2017-06-27 17:18:26
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