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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).

Alice's Birthday Party (Part 1)

[kitrub-01] - 201 users already solved this challenge, 13 are working on it.
 
 
 

Alice sends encrypted invitations for her birthday party to her friends. As it turns out, two of her friends use the same RSA parameter N. This fact allows an adversary Eve to decrypt the encrypted message without knowing the corresponding secret key.

Where does Alice's party take place? The codeword for this challenge is the location of Alice's party.
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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 (#201) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 2000 (40618) 2010-10-14 13:30:51
Dennis Nolte (JokerX) 1824 (6377) 2010-10-15 13:34:05
kyprizel (kyprizel) 1725 (20795) 2010-10-16 22:05:46
Nabb (Nabb) 1725 (13803) 2010-10-16 22:45:31
#5 No you (lolwhat) 1725 (2124) 2010-10-16 22:51:10
#6 Cezary Glowacz (cezaryglowacz) 1725 (9995) 2010-10-16 22:56:22
#7 Martin Wittiger (wittiger) 1725 (3450) 2010-10-17 01:09:30
#8 Thomas Schmucker (dg) 1725 (26066) 2010-10-17 10:37:39
#9 Claude Laveaux (claude.laveaux) 1660 (14504) 2010-10-17 21:37:37
#10 Simon Jakob (simon.jakob) 1613 (18714) 2010-10-18 19:08:33
#11 Ralf Stephan (rwst) 1613 (22735) 2010-10-18 20:06:25
#12 Michał Bartoszkiewicz (embe) 1576 (3269) 2010-10-20 02:14:53
#13 Roadrunner (rr) 1502 (12702) 2010-10-22 20:06:25
#14 piler (piler) 1433 (2818) 2010-10-27 16:25:03
#15 Armin Krauss (argh) 1433 (155287) 2010-10-27 22:56:37
#16 Christian (Etschupu) 1406 (31788) 2010-10-30 17:02:04
#17 Juan (kation) 1398 (6113) 2010-10-31 22:58:42
#18 Ulrich Armbrüster (uarmbruester) 1398 (7987) 2010-11-01 11:06:25
#19 mischa (mmisc) 1391 (22426) 2010-11-01 22:58:24
#20 Stefan Kühne (subROUTINE) 1353 (3595) 2010-11-08 17:13:44
#21 Ilya Ozerov (ilya) 1337 (20556) 2010-11-12 19:50:36
#22 chris (iceace) 1268 (2536) 2010-12-14 20:48:02
#23 Sabrina W. (sabrina) 1266 (2532) 2010-12-15 23:41:48
#24 S. N. (Tig3r) 1252 (2504) 2010-12-27 22:51:20
#25 Thomas Gonda (TomG) 1244 (33741) 2011-01-05 18:14:41
#26 Andrea Kolberger (akolberger) 1237 (1237) 2011-01-13 12:49:06
#27 Markus H. (maxxh) 1237 (3728) 2011-01-13 19:08:42
#28 Erik Rusek (Rusk) 1234 (3717) 2011-01-17 20:35:35
#29 Thomas Pfeiffer (hackfleisch) 1234 (1234) 2011-01-17 23:57:37
#30 David (aki321) 1227 (27482) 2011-01-27 17:32:57
#31 Wolfgang Weisser (wowmyst) 1222 (33108) 2011-02-03 20:19:46
#32 Fabian Bendun (benfa) 1210 (8697) 2011-02-26 22:50:35
#33 Alan Dixon (NickBourbaki) 1208 (7761) 2011-03-05 02:21:51
#34 RashmiSheetal (rashmisheetal) 1206 (2411) 2011-03-08 20:33:33
#35 J. M. (jomandi) 1180 (113270) 2011-06-02 19:10:43
#36 Daniel Fretwell (fretty) 1176 (30107) 2011-06-20 14:53:37
#37 Seth Kintigh (DarkFibre) 1170 (79471) 2011-07-19 06:11:40
#38 Peter Mustermann (Gummiboot) 1170 (60285) 2011-07-23 12:41:23
#39 Viktor (Veselovský) 1168 (113116) 2011-07-30 23:35:19
#40 Dano (Dano) 1167 (14610) 2011-08-09 10:17:12
#41 Nicolas Golubovic (qll) 1165 (14919) 2011-08-20 21:43:33
#42 dbuq (dbuq) 1165 (22762) 2011-08-21 03:00:32
#43 The Killer (Killer) 1165 (42393) 2011-08-22 00:28:33
#44 h3po (h3po) 1164 (20433) 2011-08-22 19:19:17
#45 Cleyton Muto (accepted_rush) 1164 (5578) 2011-08-24 18:19:33
#46 Flip (Flip) 1164 (31107) 2011-08-28 18:10:22
#47 Robbt Neid (Das Tupel) 1163 (9403) 2011-09-02 20:34:40
#48 Roland Jansen (roland) 1161 (17392) 2011-09-19 12:04:15
#49 Anton Wendel (MoD) 1159 (5679) 2011-09-29 21:30:29
#50 Thomas Lambert (lambert) 1158 (38594) 2011-10-07 10:01:42
#51 Bart den Hartog (Bart13) 1154 (116412) 2011-11-14 23:50:00
#52 Keith Randall (randall77) 1151 (31011) 2011-12-07 00:07:23
#53 Flo Geht_dich gar_nichts_an (flo) 1151 (6271) 2011-12-11 18:20:40
#54 Nathan (Witten) 1151 (25326) 2011-12-11 20:04:44
#55 Jan Temme (JaT3) 1150 (11694) 2011-12-22 17:26:45
#56 Mayuresh Anand (effort2break) 1148 (8728) 2012-01-06 19:27:50
#57 John (johnstosh) 1147 (4448) 2012-01-23 05:20:09
#58 Luigi Tomelli (archstanton) 1145 (95549) 2012-02-11 18:27:59
#59 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 11:38:11
#60 Martin Härterich (HaeM) 1145 (15149) 2012-02-13 16:13:18
#61 Hans Peter (hanspeter) 1144 (48115) 2012-02-19 00:22:15
#62 Lukas (Kahla) 1144 (4719) 2012-02-29 03:10:35
#63 freelancer (freelancertryme) 1142 (1142) 2012-03-16 19:10:27
#64 mallika (perepamallika) 1142 (2284) 2012-03-16 19:14:43
#65 snigdha (snigdha) 1142 (2284) 2012-03-23 06:55:30
#66 Kurt Gebauer (Yokozuna) 1141 (120839) 2012-03-29 01:09:36
#67 Steluta P. (maty_star) 1140 (5734) 2012-04-12 01:59:38
#68 Aliazer (Aliazer) 1139 (12214) 2012-04-26 22:02:46
#69 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 14:22:49
#70 Moi (MSTinaFlow) 1139 (2979) 2012-05-03 17:48:45
#71 captp (bdcht) 1138 (5864) 2012-05-10 14:26:19
#72 Dusan (xxdradus) 1138 (40134) 2012-05-19 11:59:42
#73 George (Theofanidis) 1137 (88988) 2012-05-31 08:41:33
#74 chris_3stones (3stones) 1136 (34472) 2012-06-10 13:07:55
#75 zuben c3 (zuben-c3) 1135 (15014) 2012-06-28 15:33:40
#76 Em Doulgerakis (Greko) 1134 (109970) 2012-07-13 16:11:46
#77 Stepan (m1sterx) 1133 (19165) 2012-07-31 14:59:28
#78 scout (Scout) 1131 (2368) 2012-09-08 03:01:07
#79 RPH (derichard) 1130 (27044) 2012-09-15 13:34:33
#80 vas (pet) 1130 (8197) 2012-09-23 20:12:36
#81 Hank (hanky) 1130 (22859) 2012-09-24 19:43:10
#82 Hannes (Hartmann) 1130 (8680) 2012-09-25 15:15:23
#83 E.T (Ertheb) 1128 (54872) 2012-10-25 19:03:20
#84 Lukas Juhrich (ljuhrich) 1128 (5453) 2012-11-03 22:09:04
#85 Lakshmi Ananthagopal (lakshmi87) 1128 (2256) 2012-11-04 06:21:34
#86 The Enigma (enigma) 1128 (14336) 2012-11-09 19:46:54
#87 Eugene (ZhekaS) 1128 (6037) 2012-11-11 01:16:17
#88 Friedrich Wiemer (asante) 1127 (5183) 2012-11-16 20:36:05
#89 Tron (Tron) 1126 (7381) 2012-12-22 15:21:06
#90 Julia Werdelmann (jw) 1126 (10407) 2012-12-22 23:09:00
#91 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-03 22:26:21
#92 mk (bilbobeutlin) 1122 (12340) 2013-03-19 19:45:47
#93 pb (pb) 1121 (1421) 2013-04-10 22:48:13
#94 Velko Nikolov (staafl) 1121 (13467) 2013-04-11 19:02:20
#95 Almut (problelmo) 1121 (45992) 2013-04-27 00:01:28
#96 Stefan (sdn) 1121 (5137) 2013-04-27 23:34:50
#97 Snake (snk) 1120 (51689) 2013-05-23 09:10:33
#98 Gergely Simon (george314) 1119 (16555) 2013-06-24 01:57:34
#99 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-22 00:10:41
#100 masam (jimboo) 1117 (18486) 2013-08-15 21:42:35
#101 Forrest Gump (Polyphem) 1117 (38763) 2013-08-27 13:16:55
#102 Felix (Flix) 1117 (13712) 2013-08-27 17:06:10
#103 Steve (Samacian) 1116 (23704) 2013-09-05 05:24:16
#104 Alexander (cruachan) 1116 (16051) 2013-09-29 17:44:20
#105 Boris (Kaasu) 1115 (16566) 2013-10-18 18:37:06
#106 Swathi Pai (swathi3184) 1115 (3354) 2013-11-01 19:35:57
#107 Usha Narra (usha.narra) 1115 (2230) 2013-11-01 19:40:14
#108 Fengjiao (Fengjiao) 1115 (2230) 2013-11-07 19:01:29
#109 Steve (pairate) 1115 (2230) 2013-11-07 19:53:34
#110 Brad (braddrew) 1114 (15878) 2013-12-09 08:59:03
#111 Alain (Integral) 1113 (198642) 2013-12-27 16:47:26
#112 Lucas (veered) 1113 (2226) 2013-12-28 00:00:54
#113 jonathan (munz) 1113 (8954) 2013-12-29 23:30:52
#114 Csaba Fitzl (csaby) 1113 (6696) 2014-01-01 16:36:19
#115 Pavel (haw) 1113 (22728) 2014-01-15 20:37:25
#116 Michael Doucha (mdou) 1112 (13757) 2014-02-17 15:34:42
#117 Shoukat (e195633) 1111 (10617) 2014-03-02 01:03:05
#118 Kim H. S. (tenchijin) 1111 (22681) 2014-03-03 13:09:00
#119 Duy Khanh Dau (khanh45a3kct) 1111 (5783) 2014-03-11 00:00:04
#120 hellman (hellman) 1111 (14862) 2014-03-12 15:59:45
#121 caesar ([caesar]) 1111 (10738) 2014-03-23 22:47:27
#122 Karl Schutt (günter) 1111 (34469) 2014-03-30 15:54:47
#123 Igor (idipaolo) 1109 (9421) 2014-05-23 02:11:39
#124 Francisco Moraes (fmoraes) 1109 (90044) 2014-07-03 21:41:19
#125 Manfred Wurm (Tschabobo) 1108 (7619) 2014-07-14 10:18:20
#126 Peter (51dc30ddc) 1108 (10916) 2014-07-23 22:29:14
#127 julius gaius (julius) 1108 (25581) 2014-07-27 21:25:24
#128 baz (oneiron) 1108 (12353) 2014-07-30 04:45:25
#129 Robert (rm) 1108 (56012) 2014-07-31 22:17:25
#130 Christof B. (beans90) 1108 (9488) 2014-08-11 15:07:28
#131 Alex (toincogni) 1107 (5055) 2014-09-22 16:38:00
#132 Konstantin (tempestadept) 1106 (3847) 2014-10-23 10:42:17
#133 manodivya kathiravan (manodivya) 1106 (2212) 2014-10-28 18:55:09
#134 P (newgirl21) 1106 (2212) 2014-11-08 06:31:53
#135 Javantea (Javantea) 1106 (38889) 2014-11-10 08:32:45
#136 Julia Bernotat (El Greco ) 1106 (81129) 2014-11-24 22:10:20
#137 Max Mustermann (MustermM) 1105 (6661) 2014-12-17 09:29:54
#138 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-07 00:21:04
#139 AnirudhAnand (lucif3r) 1105 (5445) 2015-01-09 08:12:21
#140 Claude Vaillancourt (Cl3v3r) 1104 (38251) 2015-01-20 15:55:35
#141 Andreas Frerichs (Ossili) 1104 (33026) 2015-01-29 20:42:40
#142 Danny Higgins (hamster147) 1104 (15597) 2015-02-15 13:30:31
#143 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-02-28 22:39:06
#144 Georgius Stolte (HazmatsFear) 1104 (14247) 2015-03-10 18:23:46
#145 R (r?) 1103 (6742) 2015-03-19 09:21:26
#146 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 13:28:23
#147 Rainer Zufall (kiekuk) 1103 (42198) 2015-04-01 09:45:27
#148 Brian Kieslich (briank) 1103 (6733) 2015-04-07 23:15:48
#149 oxylius (oxylius) 1103 (1404) 2015-04-14 20:28:06
#150 S (Dingo_the_BB) 1103 (6534) 2015-04-15 11:19:47
#151 D (devilchn) 1102 (11142) 2015-06-14 14:24:18
#152 Matthias Kotzerke (Esdeath) 1102 (4004) 2015-06-20 18:33:20
#153 Erik (Erox) 1101 (20365) 2015-07-15 19:31:45
#154 J-L Morel (Rossignol) 1101 (23146) 2015-07-29 10:31:02
#155 Sean (Kavanaugh) 1101 (29143) 2015-08-13 20:06:58
#156 Kokx (kokx) 1101 (4810) 2015-09-07 10:28:42
#157 Joerg G. (SnifferMaster) 1100 (17225) 2015-10-04 17:09:12
#158 Alain Collignon (vexilla72) 1100 (51007) 2015-10-08 12:24:58
#159 S Combes (jerva) 1100 (77932) 2015-10-24 19:14:43
#160 Martin (martinbucher) 1100 (22726) 2015-11-08 15:30:34
#161 Szabó Zoltán (szabo.z87) 1100 (47990) 2015-11-10 07:19:39
#162 Rainer (Rainer74) 1099 (8417) 2015-12-21 19:05:06
#163 Dominik M. (Sgt. Pepper) 1099 (43997) 2015-12-22 01:13:23
#164 T (Wagner) 1099 (14134) 2015-12-26 17:50:00
#165 Casaubon (cfreuden) 1099 (8515) 2016-01-13 12:53:16
#166 Vilius (wi_lius) 1098 (3497) 2016-02-13 20:41:11
#167 Ader (Vert) 1098 (2496) 2016-02-29 17:01:27
#168 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 12:26:51
#169 Peter (Garnet) 1098 (14133) 2016-03-16 09:39:06
#170 Norbert Biermann (Norbert) 1096 (40024) 2016-07-05 19:30:59
#171 Ho Chung Siu (soarerz) 1096 (5314) 2016-07-06 06:34:09
#172 Vlatiha Romanova (Vlatiha) 1096 (10223) 2016-08-02 16:40:00
#173 CESH (cesh) 1096 (4995) 2016-08-18 19:42:09
#174 Wieland (wisch) 1096 (6400) 2016-08-19 18:50:01
#175 Flo (sealth) 1096 (13472) 2016-08-22 02:35:58
#176 Sandeep (SandeepM22) 1095 (1095) 2016-09-22 03:04:39
#177 Nicolas (nicosPavlov) 1095 (71054) 2016-09-29 13:26:00
#178 neko (neko) 1095 (7679) 2016-11-20 04:36:08
#179 Wall (Hadrian) 1095 (4098) 2016-11-21 15:05:35
#180 JoGo (JoGo) 1095 (11285) 2016-12-01 19:52:33
#181 Marcel (bene1512) 1094 (20896) 2017-01-07 15:25:24
#182 Michael (FoM) 1094 (13778) 2017-01-24 12:41:51
#183 Tristan1473 (Tristan1473) 1094 (17553) 2017-02-10 11:56:07
#184 Hans Joachim Girulat (joregi) 1094 (28462) 2017-02-18 00:09:23
#185 Mir Dim (mir0soft) 1093 (49971) 2017-03-12 12:56:41
#186 chris (c2) 1093 (51973) 2017-03-14 10:06:45
#187 Vaidotas (Hurrislt) 1093 (3579) 2017-03-21 11:59:45
#188 Daniel Walder (ibex) 1093 (14372) 2017-04-11 21:39:47
#189 Nico (Nico_n) 1093 (1293) 2017-04-21 13:46:18
#190 Joel (joelhdzhdz) 1093 (3288) 2017-05-25 07:50:13
#191 john doe (misio) 1093 (5977) 2017-05-30 11:33:05
#192 Kasia (kasia-tutej) 1093 (27318) 2017-05-30 11:42:45
#193 Mihail (plexor) 1093 (10961) 2017-06-03 12:35:25
#194 Merricx (Merricx) 1092 (9088) 2017-06-12 05:41:46
#195 D3d4lu5 (D3d4lu5) 1092 (57702) 2017-06-12 08:55:12
#196 NGUYEN Ngoc Ky (kynguyenngoc) 1092 (4974) 2017-06-18 15:58:12
#197 Akonia (Akonia12) 1092 (12153) 2017-07-16 16:31:21
#198 Moomin (Mushmom) 1092 (7674) 2017-07-19 12:09:09
#199 george lasry (george4096) 1092 (281491) 2017-08-01 20:16:17
#200 juw (juw) 1092 (4179) 2017-08-11 10:38:04
#201 Immo Weber (MandelToast) 1092 (10061) 2017-08-19 16:26:27
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