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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).

Alice's Birthday Party (Part 2)

[kitrub-02] - 187 users already solved this challenge, 2 are working on it.
 
 
 

Alice has learned from her mistake from last year. This year, she makes sure that the friends to whom she sends invitations for her birthday party all use unique RSA N parameters. However, this time she still makes another mistake that allows an adversary, Eve, to reconstruct the message.

Can you again decrypt this year's invitation? The codeword for this challenge is the location of Alice's party.
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 (#187) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 2000 (40618) 2010-10-14 13:31:45
kyprizel (kyprizel) 1725 (20795) 2010-10-16 20:00:25
Nabb (Nabb) 1725 (13803) 2010-10-16 23:25:58
Cezary Glowacz (cezaryglowacz) 1725 (9995) 2010-10-16 23:53:15
#5 Martin Wittiger (wittiger) 1725 (3450) 2010-10-17 01:48:28
#6 Simon Jakob (simon.jakob) 1613 (18714) 2010-10-18 19:43:09
#7 Ralf Stephan (rwst) 1613 (22735) 2010-10-19 09:52:51
#8 Thomas Schmucker (dg) 1576 (26066) 2010-10-19 18:27:11
#9 Ulrich Dürholz (Uli) 1576 (1576) 2010-10-20 01:09:49
#10 Michał Bartoszkiewicz (embe) 1576 (3269) 2010-10-20 02:24:25
#11 Dennis Nolte (JokerX) 1502 (6377) 2010-10-22 17:01:26
#12 Roadrunner (rr) 1502 (12702) 2010-10-22 22:33:10
#13 Claude Laveaux (claude.laveaux) 1469 (14504) 2010-10-24 14:26:31
#14 Armin Krauss (argh) 1433 (153843) 2010-10-27 22:59:10
#15 Christian (Etschupu) 1406 (31788) 2010-10-30 17:02:30
#16 mischa (mmisc) 1406 (22426) 2010-10-30 18:25:49
#17 Juan (kation) 1398 (6113) 2010-11-01 01:27:03
#18 piler (piler) 1385 (2818) 2010-11-03 02:47:11
#19 David (aki321) 1378 (27482) 2010-11-03 14:48:25
#20 Stefan Kühne (subROUTINE) 1353 (3595) 2010-11-09 10:58:39
#21 Ilya Ozerov (ilya) 1327 (20556) 2010-11-15 22:29:28
#22 Ulrich Armbrüster (uarmbruester) 1321 (7987) 2010-11-17 17:48:48
#23 chris (iceace) 1268 (2536) 2010-12-14 22:40:35
#24 Sabrina W. (sabrina) 1266 (2532) 2010-12-15 23:42:07
#25 S. N. (Tig3r) 1252 (2504) 2010-12-27 21:55:31
#26 Thomas Gonda (TomG) 1244 (33741) 2011-01-05 18:16:42
#27 Markus H. (maxxh) 1237 (3728) 2011-01-13 19:09:13
#28 Erik Rusek (Rusk) 1234 (3717) 2011-01-17 20:02:34
#29 Wolfgang Weisser (wowmyst) 1229 (33108) 2011-01-25 03:04:37
#30 Fabian Bendun (benfa) 1210 (8697) 2011-02-27 22:22:19
#31 Alan Dixon (NickBourbaki) 1209 (7761) 2011-03-02 22:14:07
#32 RashmiSheetal (rashmisheetal) 1205 (2411) 2011-03-10 20:16:23
#33 Gayathri (gaayaathrees) 1205 (1205) 2011-03-11 04:37:47
#34 Sandhya (sandy_crypto) 1205 (1205) 2011-03-11 04:48:13
#35 J. M. (jomandi) 1180 (113270) 2011-06-02 18:56:34
#36 Daniel Fretwell (fretty) 1176 (30107) 2011-06-20 15:29:19
#37 Seth Kintigh (DarkFibre) 1170 (79471) 2011-07-21 07:27:13
#38 Peter Mustermann (Gummiboot) 1169 (60285) 2011-07-23 15:03:41
#39 Viktor (Veselovský) 1168 (113116) 2011-07-31 00:03:42
#40 Dano (Dano) 1167 (14610) 2011-08-09 10:51:39
#41 Nicolas Golubovic (qll) 1165 (14919) 2011-08-20 21:15:06
#42 dbuq (dbuq) 1165 (22762) 2011-08-21 12:45:42
#43 The Killer (Killer) 1165 (42393) 2011-08-22 00:17:46
#44 h3po (h3po) 1164 (20433) 2011-08-22 20:19:21
#45 Cleyton Muto (accepted_rush) 1164 (5578) 2011-08-25 00:16:13
#46 Flip (Flip) 1164 (31107) 2011-08-28 18:52:33
#47 Robbt Neid (Das Tupel) 1163 (9403) 2011-09-02 20:34:54
#48 Roland Jansen (roland) 1160 (17392) 2011-09-20 14:51:14
#49 Anton Wendel (MoD) 1159 (5679) 2011-09-30 12:53:31
#50 Thomas Lambert (lambert) 1158 (38594) 2011-10-08 12:02:03
#51 Bart den Hartog (Bart13) 1153 (116412) 2011-11-16 02:55:44
#52 Keith Randall (randall77) 1151 (31011) 2011-12-07 00:16:13
#53 Nathan (Witten) 1151 (25326) 2011-12-11 20:36:33
#54 Flo Geht_dich gar_nichts_an (flo) 1150 (6271) 2011-12-14 16:12:36
#55 Jan Temme (JaT3) 1150 (11694) 2011-12-22 17:33:19
#56 John (johnstosh) 1146 (4448) 2012-02-03 02:40:22
#57 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 11:52:32
#58 Martin Härterich (HaeM) 1145 (15149) 2012-02-13 17:18:44
#59 Hans Peter (hanspeter) 1144 (48115) 2012-02-19 01:21:30
#60 Luigi Tomelli (archstanton) 1144 (95549) 2012-02-20 10:55:10
#61 Lukas (Kahla) 1143 (4719) 2012-02-29 15:14:20
#62 mallika (perepamallika) 1142 (2284) 2012-03-16 23:34:17
#63 snigdha (snigdha) 1142 (2284) 2012-03-23 06:59:43
#64 Kurt Gebauer (Yokozuna) 1141 (120839) 2012-03-27 01:52:17
#65 Steluta P. (maty_star) 1140 (5734) 2012-04-14 02:15:16
#66 Aliazer (Aliazer) 1139 (12214) 2012-04-26 22:20:07
#67 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 14:50:24
#68 Moi (MSTinaFlow) 1139 (2979) 2012-05-03 19:24:24
#69 captp (bdcht) 1138 (5864) 2012-05-10 22:46:54
#70 Dusan (xxdradus) 1138 (40134) 2012-05-19 07:00:59
#71 George (Theofanidis) 1137 (88988) 2012-05-31 00:24:07
#72 chris_3stones (3stones) 1136 (34472) 2012-06-10 12:41:05
#73 zuben c3 (zuben-c3) 1135 (15014) 2012-06-27 13:37:01
#74 Em Doulgerakis (Greko) 1134 (109970) 2012-07-12 10:53:05
#75 Stepan (m1sterx) 1131 (19165) 2012-09-06 08:45:44
#76 RPH (derichard) 1130 (27044) 2012-09-16 12:40:14
#77 vas (pet) 1130 (8197) 2012-09-23 21:01:29
#78 Hank (hanky) 1130 (22859) 2012-09-25 21:55:59
#79 Hannes (Hartmann) 1130 (8680) 2012-09-25 22:47:33
#80 scout (Scout) 1129 (2368) 2012-10-12 04:55:08
#81 E.T (Ertheb) 1128 (54872) 2012-10-25 20:53:33
#82 Lakshmi Ananthagopal (lakshmi87) 1128 (2256) 2012-11-04 06:27:34
#83 The Enigma (enigma) 1128 (14336) 2012-11-09 20:53:42
#84 Eugene (ZhekaS) 1128 (6037) 2012-11-11 02:00:41
#85 Friedrich Wiemer (asante) 1127 (5183) 2012-11-16 16:50:37
#86 Tron (Tron) 1126 (7381) 2012-12-22 16:48:01
#87 Julia Werdelmann (jw) 1126 (10407) 2012-12-23 00:09:33
#88 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-03 22:47:19
#89 mk (bilbobeutlin) 1122 (12340) 2013-03-19 20:31:23
#90 Velko Nikolov (staafl) 1121 (13467) 2013-04-11 23:21:51
#91 Almut (problelmo) 1121 (45992) 2013-04-27 08:03:33
#92 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-22 11:22:49
#93 masam (jimboo) 1117 (18486) 2013-08-17 01:43:14
#94 Forrest Gump (Polyphem) 1117 (38763) 2013-08-27 16:06:20
#95 Felix (Flix) 1117 (13712) 2013-08-27 18:16:41
#96 Steve (Samacian) 1116 (23704) 2013-09-05 06:14:13
#97 Gergely Simon (george314) 1116 (16555) 2013-09-27 20:49:54
#98 Alexander (cruachan) 1116 (16051) 2013-09-28 19:48:46
#99 Snake (snk) 1115 (51689) 2013-10-07 16:13:00
#100 Boris (Kaasu) 1115 (16566) 2013-10-18 18:57:48
#101 Swathi Pai (swathi3184) 1115 (3354) 2013-11-01 19:33:40
#102 Usha Narra (usha.narra) 1115 (2230) 2013-11-01 20:28:21
#103 Steve (pairate) 1115 (2230) 2013-11-03 22:40:52
#104 Fengjiao (Fengjiao) 1115 (2230) 2013-11-07 19:05:09
#105 Brad (braddrew) 1114 (15878) 2013-12-09 10:34:55
#106 Lucas (veered) 1113 (2226) 2013-12-28 10:58:36
#107 Alain (Integral) 1113 (198642) 2013-12-28 16:27:05
#108 jonathan (munz) 1113 (8954) 2013-12-30 22:54:06
#109 Csaba Fitzl (csaby) 1113 (6696) 2014-01-01 19:34:29
#110 Pavel (haw) 1113 (22728) 2014-01-12 19:31:51
#111 Michael Doucha (mdou) 1112 (13757) 2014-02-17 18:10:12
#112 Duy Khanh Dau (khanh45a3kct) 1111 (5783) 2014-03-11 00:06:26
#113 hellman (hellman) 1111 (14862) 2014-03-12 16:23:00
#114 caesar ([caesar]) 1111 (10738) 2014-03-23 22:53:52
#115 Karl Schutt (günter) 1111 (34469) 2014-03-30 17:34:31
#116 Igor (idipaolo) 1109 (9421) 2014-05-23 02:39:18
#117 Michael (pheenyx) 1109 (3840) 2014-05-23 21:51:34
#118 Francisco Moraes (fmoraes) 1109 (90044) 2014-07-05 05:29:35
#119 Manfred Wurm (Tschabobo) 1108 (7619) 2014-07-14 10:32:36
#120 julius gaius (julius) 1108 (25581) 2014-07-21 09:01:13
#121 Peter (51dc30ddc) 1108 (10916) 2014-07-23 23:05:35
#122 Robert (rm) 1108 (56012) 2014-07-31 22:18:25
#123 baz (oneiron) 1108 (12353) 2014-08-05 03:12:20
#124 Christof B. (beans90) 1108 (9488) 2014-08-16 17:11:46
#125 Alex (toincogni) 1107 (5055) 2014-09-22 22:34:36
#126 manodivya kathiravan (manodivya) 1106 (2212) 2014-10-28 18:58:46
#127 Samyuktha Tina (samyusridhar) 1106 (2218) 2014-11-07 20:08:56
#128 P (newgirl21) 1106 (2212) 2014-11-08 06:37:36
#129 Javantea (Javantea) 1106 (38889) 2014-11-11 03:42:46
#130 Julia Bernotat (El Greco ) 1106 (81129) 2014-11-26 01:00:48
#131 AnirudhAnand (lucif3r) 1105 (5445) 2015-01-09 09:17:23
#132 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-10 16:19:05
#133 Claude Vaillancourt (Cl3v3r) 1104 (38251) 2015-01-20 15:56:55
#134 Shoukat (e195633) 1104 (10617) 2015-01-31 01:09:08
#135 Danny Higgins (hamster147) 1104 (14185) 2015-02-15 16:16:23
#136 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-03-01 17:10:34
#137 R (r?) 1103 (6742) 2015-03-19 10:16:46
#138 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 13:32:28
#139 Rainer Zufall (kiekuk) 1103 (42198) 2015-04-01 10:15:15
#140 Brian Kieslich (briank) 1103 (6733) 2015-04-14 03:57:06
#141 S (Dingo_the_BB) 1103 (6534) 2015-04-15 21:20:18
#142 D (devilchn) 1102 (11142) 2015-06-14 21:45:04
#143 Erik (Erox) 1101 (20365) 2015-07-15 22:19:48
#144 J-L Morel (Rossignol) 1101 (23146) 2015-07-29 14:06:20
#145 Sean (Kavanaugh) 1101 (29143) 2015-08-13 20:08:19
#146 Kokx (kokx) 1101 (4810) 2015-09-07 13:56:44
#147 Ylona (Sirene) 1101 (4425) 2015-09-07 14:26:48
#148 Joerg G. (SnifferMaster) 1100 (17225) 2015-10-04 17:52:25
#149 Alain Collignon (vexilla72) 1100 (51007) 2015-10-08 11:07:52
#150 S Combes (jerva) 1100 (77932) 2015-10-24 20:29:53
#151 Martin (martinbucher) 1100 (22726) 2015-11-09 15:27:42
#152 Szabó Zoltán (szabo.z87) 1100 (47990) 2015-11-10 07:29:42
#153 Rainer (Rainer74) 1099 (8417) 2015-12-21 19:06:00
#154 Dominik M. (Sgt. Pepper) 1099 (43997) 2015-12-22 02:54:08
#155 T (Wagner) 1099 (13934) 2015-12-26 15:58:02
#156 Casaubon (cfreuden) 1099 (8515) 2016-01-13 15:28:13
#157 Vilius (wi_lius) 1098 (3497) 2016-02-14 12:53:46
#158 Andreas Frerichs (Ossili) 1098 (33026) 2016-02-17 19:11:02
#159 Ader (Vert) 1098 (2496) 2016-02-29 17:07:12
#160 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 14:25:51
#161 Peter (Garnet) 1098 (14033) 2016-03-16 13:59:33
#162 Norbert Biermann (Norbert) 1096 (40024) 2016-07-05 22:32:23
#163 Ho Chung Siu (soarerz) 1096 (5314) 2016-07-06 07:02:56
#164 Vlatiha Romanova (Vlatiha) 1096 (10223) 2016-08-03 13:59:43
#165 CESH (cesh) 1096 (4995) 2016-08-18 20:13:56
#166 Wieland (wisch) 1096 (6400) 2016-08-20 12:18:42
#167 Flo (sealth) 1096 (13472) 2016-08-22 03:11:19
#168 Nicolas (nicosPavlov) 1095 (70954) 2016-09-29 17:17:52
#169 ender (endered) 1095 (5478) 2016-11-20 03:30:43
#170 neko (neko) 1095 (7679) 2016-11-20 03:38:47
#171 JoGo (JoGo) 1095 (11285) 2016-12-02 17:05:15
#172 Marcel (bene1512) 1094 (20896) 2017-01-07 19:02:11
#173 Michael (FoM) 1094 (13778) 2017-01-25 02:09:41
#174 Georgius Stolte (HazmatsFear) 1094 (14247) 2017-02-08 18:57:20
#175 Tristan1473 (Tristan1473) 1094 (17553) 2017-02-10 13:00:22
#176 Hans Joachim Girulat (joregi) 1094 (28462) 2017-02-25 19:40:49
#177 Mir Dim (mir0soft) 1093 (48879) 2017-03-12 14:37:52
#178 chris (c2) 1093 (51973) 2017-03-14 10:30:52
#179 Vaidotas (Hurrislt) 1093 (3579) 2017-03-21 15:49:11
#180 Daniel Walder (ibex) 1093 (14372) 2017-04-11 21:45:10
#181 Joel (joelhdzhdz) 1093 (3288) 2017-05-26 02:48:25
#182 john doe (misio) 1093 (5977) 2017-05-30 11:53:18
#183 Kasia (kasia-tutej) 1093 (24028) 2017-05-30 11:57:26
#184 Mihail (plexor) 1093 (10961) 2017-06-03 14:57:16
#185 D3d4lu5 (D3d4lu5) 1092 (18420) 2017-06-12 18:34:06
#186 Merricx (Merricx) 1092 (9088) 2017-06-13 16:11:56
#187 NGUYEN Ngoc Ky (kynguyenngoc) 1092 (3280) 2017-06-18 18:14:11
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