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Level II Challenges (93)

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

ORYX Stream Cipher — Part 3 (revised)

[stamp-13] - 23 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: 2013-06-06 20:39
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#23) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (109843) 2013-06-06 22:17:21
J. M. (jomandi) 2000 (113270) 2013-06-06 23:37:08
Kurt Gebauer (Yokozuna) 2000 (120839) 2013-06-07 03:14:23
George (Theofanidis) 2000 (88988) 2013-06-07 05:16:04
#5 Armin Krauss (argh) 2000 (149821) 2013-06-07 20:33:29
#6 Hans Peter (hanspeter) 1547 (48115) 2013-06-13 12:21:44
#7 Luigi Tomelli (archstanton) 1523 (95549) 2013-06-13 22:19:41
#8 Em Doulgerakis (Greko) 1349 (109970) 2013-07-03 09:44:44
#9 zahir mohsen moradi (ariobarzan) 1337 (99757) 2013-07-06 06:44:49
#10 Forrest Gump (Polyphem) 1196 (38763) 2013-11-25 21:40:40
#11 Francisco Moraes (fmoraes) 1194 (90044) 2013-12-01 06:21:38
#12 Alain (Integral) 1180 (198642) 2014-01-20 17:25:01
#13 Bart den Hartog (Bart13) 1163 (116412) 2014-04-22 23:36:42
#14 S Combes (jerva) 1137 (77932) 2015-01-25 09:27:26
#15 Claude Vaillancourt (Cl3v3r) 1134 (38251) 2015-03-06 17:02:44
#16 E.T (Ertheb) 1127 (54872) 2015-07-14 12:08:23
#17 Javantea (Javantea) 1125 (38889) 2015-08-28 20:04:24
#18 Martin Härterich (HaeM) 1124 (15149) 2015-10-06 14:59:08
#19 Alain Collignon (vexilla72) 1121 (48599) 2015-12-17 19:31:00
#20 Julia Bernotat (El Greco ) 1120 (81129) 2015-12-31 13:58:43
#21 Karl Schutt (günter) 1118 (34469) 2016-03-20 19:29:38
#22 Rider (alrider) 1113 (7214) 2016-09-05 00:06:31
#23 Nicolas (nicosPavlov) 1111 (70954) 2016-11-04 18:01:00
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