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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).

Partial Key Exposure with RSA — Part 1

[koy-01] - 58 users already solved this challenge, 10 are working on it.
 
 
 

With RSA keys, the private key d must remain private. If the public key e is very small, this is not completely possible. This exercise demonstrates how simple it is to compute a portion of the secret key d.
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Published on: 2012-02-11 13:20
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#58) Achieved points (Global score) y-m-d - h:m:s

Bart den Hartog (Bart13) 2000 (116412) 2012-02-11 13:23:49
Viktor (Veselovský) 2000 (113116) 2012-02-11 13:32:57
J. M. (jomandi) 2000 (113270) 2012-02-11 13:58:47
Nathan (Witten) 2000 (25326) 2012-02-11 14:53:02
#5 The Killer (Killer) 2000 (42393) 2012-02-11 15:19:01
#6 Armin Krauss (argh) 2000 (153843) 2012-02-11 16:11:07
#7 Michel Van Caneghem (vancan) 2000 (49719) 2012-02-11 17:53:01
#8 Seth Kintigh (DarkFibre) 2000 (79471) 2012-02-11 20:11:15
#9 Peter Mustermann (Gummiboot) 1824 (60285) 2012-02-12 14:49:20
#10 Jean-Baptiste Mossé (intersect) 1576 (1676) 2012-02-16 13:24:30
#11 Martin Härterich (HaeM) 1398 (15149) 2012-02-28 16:17:44
#12 Thomas Gonda (TomG) 1362 (33741) 2012-03-05 15:41:48
#13 Luigi Tomelli (archstanton) 1362 (95549) 2012-03-05 16:10:07
#14 Keith Randall (randall77) 1362 (31011) 2012-03-06 01:42:39
#15 Kurt Gebauer (Yokozuna) 1279 (120839) 2012-04-05 13:18:28
#16 Hans Peter (hanspeter) 1278 (48115) 2012-04-05 22:03:17
#17 Aliazer (Aliazer) 1258 (12214) 2012-04-20 21:27:38
#18 Thomas Lambert (lambert) 1256 (38594) 2012-04-21 18:04:08
#19 chris_3stones (3stones) 1187 (34472) 2012-08-30 08:14:28
#20 George (Theofanidis) 1187 (88988) 2012-08-30 08:15:34
#21 Em Doulgerakis (Greko) 1187 (109970) 2012-08-30 08:43:59
#22 Claude Laveaux (claude.laveaux) 1163 (14504) 2012-12-31 13:56:38
#23 Velko Nikolov (staafl) 1149 (13467) 2013-04-25 01:22:32
#24 Almut (problelmo) 1144 (45992) 2013-06-18 20:55:18
#25 zahir mohsen moradi (ariobarzan) 1143 (99757) 2013-07-06 16:45:54
#26 Daniel Fretwell (fretty) 1140 (30107) 2013-08-08 15:49:56
#27 Forrest Gump (Polyphem) 1138 (38763) 2013-09-09 02:08:31
#28 Tanuvir Singh (tanuvir) 1135 (1335) 2013-10-26 21:12:00
#29 Rohit Vobbilisetty (vrohit13) 1135 (1135) 2013-10-26 21:19:12
#30 Francisco Moraes (fmoraes) 1134 (90044) 2013-11-17 22:03:09
#31 Brad (braddrew) 1132 (15878) 2013-12-23 05:04:34
#32 Alain (Integral) 1130 (198642) 2014-02-01 17:22:12
#33 hellman (hellman) 1128 (14862) 2014-03-12 15:48:44
#34 Michael Doucha (mdou) 1126 (13757) 2014-04-14 22:01:32
#35 Thomas Schmucker (dg) 1125 (26066) 2014-05-11 23:29:09
#36 BHAVNA (bhavna) 1119 (1119) 2014-10-14 00:34:45
#37 Bhavna Gurnani (Bhavna Gurnani) 1118 (1118) 2014-11-08 01:35:37
#38 Julia Bernotat (El Greco ) 1117 (81129) 2014-11-29 00:38:21
#39 Robert (rm) 1117 (56012) 2014-12-05 01:22:25
#40 Hank (hanky) 1116 (22859) 2015-01-25 19:07:36
#41 Jeremy Chuang (jeremhh) 1115 (6643) 2015-02-17 01:18:18
#42 R (r?) 1114 (6742) 2015-03-15 22:45:15
#43 Claude Vaillancourt (Cl3v3r) 1110 (38251) 2015-08-12 15:45:55
#44 Javantea (Javantea) 1110 (38889) 2015-08-27 18:37:35
#45 Sean (Kavanaugh) 1110 (29143) 2015-09-15 00:47:45
#46 S Combes (jerva) 1109 (77932) 2015-10-24 18:11:40
#47 Szabó Zoltán (szabo.z87) 1108 (47990) 2015-11-12 12:31:39
#48 Alain Collignon (vexilla72) 1108 (51007) 2015-11-18 10:00:05
#49 Dominik M. (Sgt. Pepper) 1107 (43997) 2015-12-23 14:26:07
#50 Andreas Frerichs (Ossili) 1106 (33026) 2016-02-26 20:26:07
#51 Rainer Zufall (kiekuk) 1106 (42198) 2016-02-26 23:24:36
#52 Norbert Biermann (Norbert) 1104 (40024) 2016-07-10 20:28:32
#53 Nicolas (nicosPavlov) 1102 (70954) 2016-10-18 18:14:10
#54 Tristan1473 (Tristan1473) 1100 (17553) 2017-02-04 09:18:00
#55 Georgius Stolte (HazmatsFear) 1100 (14247) 2017-02-27 20:32:15
#56 Mir Dim (mir0soft) 1099 (48879) 2017-03-29 14:58:43
#57 chris (c2) 1099 (51973) 2017-04-02 16:28:52
#58 Kasia (kasia-tutej) 1098 (25120) 2017-06-01 15:14:34
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