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Level II Challenges (103)

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

RSA: Two different keys — same ciphertext

[brunner-02] - 115 users already solved this challenge, 9 are working on it.
 
 
 

You found out that a message encrypted with two different public keys but same modulus yield to the same ciphertexts. Are you able to name the smallest private key to decrypt ciphertexts that were generated with this parameters?
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-08-15 17:03
Maximum number of attempts for this challenge: 99

All successful users of this challenge

Rank User (#115) Achieved points (Global score) y-m-d - h:m:s

Daniel Fretwell (fretty) 2000 (30107) 2011-08-15 19:34:25
Armin Krauss (argh) 2000 (164447) 2011-08-15 19:49:05
Viktor (Veselovský) 2000 (123039) 2011-08-15 20:15:53
Seth Kintigh (DarkFibre) 2000 (79471) 2011-08-15 20:37:50
#5 J. M. (jomandi) 2000 (113270) 2011-08-15 21:52:33
#6 mischa (mmisc) 2000 (22426) 2011-08-16 02:37:29
#7 Dano (Dano) 2000 (14610) 2011-08-16 02:55:19
#8 Peter Mustermann (Gummiboot) 1824 (60285) 2011-08-16 22:09:03
#9 dbuq (dbuq) 1824 (22762) 2011-08-17 16:29:11
#10 Robbt Neid (Das Tupel) 1725 (9403) 2011-08-17 21:37:18
#11 Nicolas Golubovic (qll) 1725 (14919) 2011-08-17 22:42:58
#12 Flip (Flip) 1725 (31107) 2011-08-18 14:14:30
#13 kyprizel (kyprizel) 1725 (20795) 2011-08-18 14:27:20
#14 David (aki321) 1547 (27482) 2011-08-21 17:54:42
#15 The Killer (Killer) 1547 (42393) 2011-08-22 00:04:00
#16 h3po (h3po) 1523 (20433) 2011-08-22 22:54:04
#17 Christian Inci (ch100) 1324 (7761) 2011-09-18 01:30:51
#18 Thomas Lambert (lambert) 1286 (38594) 2011-10-03 17:37:17
#19 Keith Randall (randall77) 1249 (31011) 2011-11-01 05:59:47
#20 Bart den Hartog (Bart13) 1222 (118984) 2011-12-07 15:44:52
#21 Nathan (Witten) 1217 (25326) 2011-12-16 00:00:09
#22 Jan Temme (JaT3) 1214 (11694) 2011-12-22 08:18:21
#23 Michel Van Caneghem (vancan) 1193 (49719) 2012-02-12 23:15:13
#24 Hans Peter (hanspeter) 1190 (48115) 2012-02-21 21:22:06
#25 Luigi Tomelli (archstanton) 1185 (95549) 2012-03-12 09:59:52
#26 FirstLast (TheRational) 1184 (1753) 2012-03-16 00:37:11
#27 Thomas Gonda (TomG) 1184 (33741) 2012-03-16 20:41:48
#28 sam (sam.jerry) 1184 (1184) 2012-03-17 03:16:37
#29 ranjith (ranjith.kumar) 1184 (1184) 2012-03-17 03:21:43
#30 Kurt Gebauer (Yokozuna) 1181 (133741) 2012-03-28 13:14:29
#31 George (Theofanidis) 1173 (93479) 2012-05-05 19:18:44
#32 Dusan (xxdradus) 1169 (40236) 2012-05-28 10:40:18
#33 chris_3stones (3stones) 1167 (37759) 2012-06-10 12:38:36
#34 zuben c3 (zuben-c3) 1164 (15014) 2012-06-28 12:05:56
#35 Em Doulgerakis (Greko) 1161 (113859) 2012-07-16 16:57:03
#36 Christian (Etschupu) 1161 (31788) 2012-07-17 12:00:03
#37 Stepan (m1sterx) 1154 (19165) 2012-09-07 07:59:29
#38 RPH (derichard) 1153 (27044) 2012-09-16 15:57:23
#39 Hank (hanky) 1150 (22859) 2012-10-18 19:11:53
#40 E.T (Ertheb) 1149 (62144) 2012-10-27 17:23:29
#41 Binit (binit.00354) 1148 (1248) 2012-11-05 23:14:54
#42 The Enigma (enigma) 1147 (14336) 2012-11-13 19:01:45
#43 Claude Laveaux (claude.laveaux) 1143 (14504) 2012-12-31 00:39:12
#44 Shailesh Padave (shaileshpadave) 1138 (2261) 2013-03-21 06:13:51
#45 mk (bilbobeutlin) 1136 (12340) 2013-04-20 10:55:19
#46 Velko Nikolov (staafl) 1136 (13467) 2013-04-20 19:53:39
#47 Almut (problelmo) 1135 (45992) 2013-04-29 08:56:12
#48 Gergely Simon (george314) 1132 (16555) 2013-06-26 01:44:59
#49 Wolfgang Weisser (wowmyst) 1131 (33108) 2013-07-12 21:03:05
#50 zahir mohsen moradi (ariobarzan) 1131 (99757) 2013-07-15 21:12:03
#51 Philipp Hammer-Pohlau (phase2) 1130 (17981) 2013-07-24 12:50:23
#52 Ralf Stephan (rwst) 1130 (22735) 2013-07-29 10:23:44
#53 Forrest Gump (Polyphem) 1128 (38763) 2013-08-29 00:08:48
#54 Steve (Samacian) 1126 (23704) 2013-10-11 07:22:55
#55 Boris (Kaasu) 1125 (16566) 2013-11-04 19:02:34
#56 Jaideep (Illusionist21) 1125 (1325) 2013-11-07 19:14:20
#57 Nikitha Ganesh (nikitha.ganesh) 1125 (1125) 2013-11-07 22:41:39
#58 Francisco Moraes (fmoraes) 1125 (90044) 2013-11-11 22:26:56
#59 Brad (braddrew) 1123 (15878) 2013-12-21 02:07:34
#60 Max Mustermann (MustermM) 1123 (6661) 2014-01-06 18:48:32
#61 Alain (Integral) 1123 (198642) 2014-01-06 19:18:21
#62 Pavel (haw) 1122 (22728) 2014-01-13 13:07:02
#63 Kim H. S. (tenchijin) 1121 (25265) 2014-03-04 14:41:54
#64 hellman (hellman) 1120 (14862) 2014-03-13 10:01:45
#65 Karl Schutt (günter) 1119 (34469) 2014-04-06 12:39:58
#66 Thomas Schmucker (dg) 1118 (26066) 2014-05-07 13:58:32
#67 Igor (idipaolo) 1118 (10639) 2014-05-22 18:04:27
#68 Snake (snk) 1117 (61366) 2014-06-06 10:02:42
#69 Peter (51dc30ddc) 1116 (10916) 2014-07-27 00:56:40
#70 julius gaius (julius) 1116 (25581) 2014-07-31 01:55:41
#71 Robert (rm) 1116 (56362) 2014-07-31 23:15:56
#72 Christof B. (beans90) 1115 (9488) 2014-08-10 22:52:31
#73 baz (oneiron) 1115 (12353) 2014-08-15 07:00:09
#74 yubo (yubo) 1113 (1113) 2014-11-04 03:42:43
#75 Julia Bernotat (El Greco ) 1112 (81129) 2014-11-27 21:43:00
#76 Kai Ludwig (TalentRaspel) 1111 (15704) 2015-01-13 01:15:34
#77 Claude Vaillancourt (Cl3v3r) 1111 (38251) 2015-01-14 18:41:21
#78 Shoukat (e195633) 1110 (10617) 2015-02-12 22:02:06
#79 Konstantin Golovan (SoulShaker) 1110 (14091) 2015-03-10 17:02:06
#80 lankbumbum (lankbumbum) 1110 (1310) 2015-03-17 05:06:31
#81 Jie Chen (vmd) 1110 (3336) 2015-03-20 07:17:30
#82 Jayesh (jayesh) 1110 (1110) 2015-03-21 03:25:15
#83 Jeremy Chuang (jeremhh) 1110 (6643) 2015-03-21 03:34:01
#84 lihao (gelihao609) 1110 (3335) 2015-03-21 04:20:01
#85 R (r?) 1110 (6742) 2015-03-21 07:03:40
#86 Rainer Zufall (kiekuk) 1109 (48700) 2015-04-01 11:48:38
#87 Sean (Kavanaugh) 1106 (29143) 2015-08-14 08:51:09
#88 Javantea (Javantea) 1106 (38889) 2015-08-17 22:33:32
#89 Alain Collignon (vexilla72) 1105 (59581) 2015-10-30 17:47:39
#90 S Combes (jerva) 1105 (81932) 2015-11-07 08:26:06
#91 Martin (martinbucher) 1105 (27363) 2015-11-10 11:27:09
#92 Szabó Zoltán (szabo.z87) 1105 (47990) 2015-11-19 07:13:38
#93 Dominik M. (Sgt. Pepper) 1104 (55873) 2015-12-22 15:26:39
#94 T (Wagner) 1104 (16887) 2015-12-30 13:29:27
#95 Andreas Frerichs (Ossili) 1103 (33266) 2016-02-22 11:31:02
#96 Anupreet Kaur (anupreet.kaur) 1103 (1103) 2016-03-05 22:09:25
#97 Shreeraj (shreeraj1746) 1103 (1103) 2016-03-05 23:17:19
#98 Marco Manfredi (mkk9901) 1102 (17686) 2016-03-14 22:14:01
#99 Norbert Biermann (Norbert) 1101 (40024) 2016-07-06 16:57:08
#100 Flo (sealth) 1100 (13472) 2016-08-22 05:45:48
#101 Nicolas (nicosPavlov) 1099 (102215) 2016-10-05 17:35:05
#102 Simon Jakob (simon.jakob) 1098 (18714) 2016-11-29 19:43:15
#103 JoGo (JoGo) 1098 (11285) 2016-12-05 15:16:55
#104 Marcel (bene1512) 1098 (20896) 2017-01-07 21:24:58
#105 Michael (FoM) 1098 (13778) 2017-01-29 22:55:07
#106 Tristan1473 (Tristan1473) 1098 (18914) 2017-02-05 11:03:09
#107 Mir Dim (mir0soft) 1097 (72404) 2017-03-18 07:28:30
#108 chris (c2) 1097 (51973) 2017-03-26 21:10:22
#109 Kasia (kasia-tutej) 1096 (45961) 2017-06-04 14:33:07
#110 Mihail (plexor) 1096 (14076) 2017-06-08 14:40:56
#111 D3d4lu5 (D3d4lu5) 1096 (73077) 2017-07-02 03:46:17
#112 Akonia (Akonia12) 1095 (12153) 2017-07-22 13:03:03
#113 george lasry (george4096) 1095 (281594) 2017-08-05 16:10:38
#114 Godfrey Norton (Godfrey) 1095 (4889) 2017-08-06 14:52:38
#115 Immo Weber (MandelToast) 1095 (10061) 2017-08-19 20:33:41
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