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Level II Challenges (158)

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

Not-so-Secret Message from Malawi — Part I (RSA)

[schaefer-01] - 186 users already solved this challenge, 4 are working on it.
 
 
 

When creating RSA keys, it is important to choose the n and e parameters wisely. This was not done in this example, and thus you should be able to decipher this ciphertext message sent from Malawi. The plaintext gives the codeword, which is related to the photo.
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: 50

All successful users of this challenge

Rank User (#186) Achieved points (Global score) y-m-d - h:m:s

das (dasdas) 1725 (1925) 2010-10-17 12:25:10
Thomas Schmucker (dg) 1660 (26066) 2010-10-17 17:38:16
Cezary Glowacz (cezaryglowacz) 1660 (9995) 2010-10-17 21:51:03
kyprizel (kyprizel) 1660 (20795) 2010-10-18 06:51:50
#5 Mathias Herrmann (mazze) 1576 (3302) 2010-10-19 13:45:21
#6 Nobody (nobody) 1576 (42945) 2010-10-19 22:44:55
#7 Simon Jakob (simon.jakob) 1523 (18714) 2010-10-22 02:01:36
#8 Juan (kation) 1385 (6113) 2010-11-02 18:10:15
#9 Sven Ge (Sven-from-de) 1353 (2852) 2010-11-08 23:45:57
#10 mischa (mmisc) 1225 (22426) 2011-01-31 02:36:02
#11 David (aki321) 1216 (27482) 2011-02-14 16:42:56
#12 Armin Krauss (argh) 1206 (206965) 2011-03-08 22:23:48
#13 Wolfgang Weisser (wowmyst) 1201 (33108) 2011-03-21 15:16:08
#14 Ishaan (Ishaan) 1200 (1200) 2011-03-23 02:32:59
#15 Sepp Maier (smai) 1191 (1898) 2011-04-20 10:23:39
#16 Tom Tailor (-=Aloras=-) 1188 (1390) 2011-04-28 19:37:45
#17 Roland Jansen (roland) 1187 (17607) 2011-05-04 18:08:00
#18 J. M. (jomandi) 1179 (113270) 2011-06-05 23:39:35
#19 Peter Mustermann (Gummiboot) 1169 (60285) 2011-07-24 21:20:14
#20 Daniel Fretwell (fretty) 1166 (30107) 2011-08-13 13:08:25
#21 Viktor (Veselovský) 1166 (169444) 2011-08-13 21:18:22
#22 Seth Kintigh (DarkFibre) 1166 (79471) 2011-08-14 06:56:30
#23 Joerg Schneider (jcs) 1166 (1166) 2011-08-15 10:37:44
#24 Nicolas Golubovic (qll) 1165 (14919) 2011-08-17 16:19:08
#25 Flip (Flip) 1165 (31107) 2011-08-18 18:22:10
#26 h3po (h3po) 1165 (20433) 2011-08-21 19:50:53
#27 dbuq (dbuq) 1165 (22762) 2011-08-21 22:22:07
#28 The Killer (Killer) 1159 (42393) 2011-10-02 03:08:22
#29 Dano (Dano) 1159 (14610) 2011-10-03 00:18:20
#30 Thomas Gonda (TomG) 1158 (36291) 2011-10-04 21:49:45
#31 Thomas Lambert (lambert) 1158 (38594) 2011-10-09 13:00:42
#32 Bart den Hartog (Bart13) 1153 (148936) 2011-11-18 02:34:51
#33 Keith Randall (randall77) 1152 (31011) 2011-12-04 07:29:42
#34 Nathan (Witten) 1151 (25326) 2011-12-08 01:36:54
#35 jacobian1729 (jacobian1729) 1147 (5584) 2012-01-22 17:42:34
#36 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 16:31:49
#37 Martin Härterich (HaeM) 1145 (15149) 2012-02-16 10:30:03
#38 Luigi Tomelli (archstanton) 1144 (127538) 2012-02-25 10:49:00
#39 Hans Peter (hanspeter) 1141 (52356) 2012-04-03 09:45:52
#40 Kurt Gebauer (Yokozuna) 1141 (282608) 2012-04-03 17:31:35
#41 Aliazer (Aliazer) 1140 (12521) 2012-04-20 21:21:05
#42 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 21:50:23
#43 Dusan (xxdradus) 1137 (40436) 2012-05-23 08:47:23
#44 Alastair Aitchison (tanoshimi) 1136 (1236) 2012-06-12 19:56:33
#45 Daniel Richter (TheHiveMind) 1136 (11450) 2012-06-14 10:18:00
#46 Ralf Stephan (rwst) 1135 (25229) 2012-06-24 17:14:29
#47 Christian (Etschupu) 1134 (31788) 2012-07-13 10:42:43
#48 fergus (fergus) 1131 (1944) 2012-09-04 14:41:44
#49 RPH (derichard) 1130 (27044) 2012-09-16 14:29:16
#50 Hank (hanky) 1130 (24373) 2012-09-29 22:07:19
#51 Mangesh (mangesh) 1129 (1129) 2012-10-14 00:44:26
#52 Santosh (santoshy2k007) 1129 (1129) 2012-10-14 02:15:13
#53 E.T (Ertheb) 1128 (81809) 2012-10-29 18:45:19
#54 The Enigma (enigma) 1128 (14336) 2012-11-12 18:50:52
#55 Claude Laveaux (claude.laveaux) 1125 (14504) 2012-12-30 17:32:06
#56 Em Doulgerakis (Greko) 1125 (193799) 2013-01-11 11:47:58
#57 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-02 21:49:14
#58 Ben (Koerber) 1124 (2642) 2013-02-11 04:05:01
#59 mk (bilbobeutlin) 1121 (12340) 2013-04-08 21:26:09
#60 Velko Nikolov (staafl) 1121 (13467) 2013-04-18 14:07:30
#61 Almut (problelmo) 1120 (45992) 2013-05-07 06:10:50
#62 Gergely Simon (george314) 1119 (17850) 2013-06-28 11:02:43
#63 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-23 17:19:01
#64 George (Theofanidis) 1117 (130187) 2013-08-07 19:30:30
#65 cyclops (cyclops) 1117 (2549) 2013-08-22 18:14:22
#66 Forrest Gump (Polyphem) 1117 (38763) 2013-08-28 00:33:00
#67 Steve (Samacian) 1116 (23915) 2013-09-09 07:41:52
#68 Alexander (cruachan) 1116 (16051) 2013-09-29 20:17:22
#69 Boris (Kaasu) 1115 (16566) 2013-10-22 09:12:59
#70 Francisco Moraes (fmoraes) 1114 (90044) 2013-11-11 21:46:32
#71 Brad (braddrew) 1114 (15878) 2013-12-09 09:53:17
#72 jonathan (munz) 1113 (8954) 2013-12-31 22:39:25
#73 Alain (Integral) 1113 (207924) 2014-01-06 15:45:55
#74 Pavel (haw) 1113 (22728) 2014-01-16 16:18:02
#75 Michael Doucha (mdou) 1112 (13757) 2014-02-17 20:04:45
#76 Marcel (bene1512) 1112 (20896) 2014-02-19 19:50:12
#77 Kim H. S. (tenchijin) 1112 (25468) 2014-02-21 14:13:26
#78 hellman (hellman) 1111 (14862) 2014-03-12 16:25:21
#79 masam (jimboo) 1111 (18687) 2014-03-30 20:10:00
#80 caesar ([caesar]) 1111 (10738) 2014-04-03 15:28:37
#81 Ben (Paulsen) 1111 (2421) 2014-04-06 02:09:25
#82 Karl Schutt (günter) 1111 (44374) 2014-04-06 22:46:19
#83 Snake (snk) 1109 (187783) 2014-06-18 18:24:10
#84 Peter (51dc30ddc) 1108 (10916) 2014-07-26 23:32:42
#85 julius gaius (julius) 1108 (25581) 2014-07-27 21:13:06
#86 Robert (rm) 1108 (56475) 2014-07-31 23:14:46
#87 Christof B. (beans90) 1108 (9488) 2014-08-12 16:53:23
#88 baz (oneiron) 1108 (12353) 2014-08-13 08:11:33
#89 Charles Bocage (diesal9) 1107 (1107) 2014-09-23 12:28:25
#90 Javantea (Javantea) 1106 (40816) 2014-11-19 02:45:59
#91 Julia Bernotat (El Greco ) 1105 (81129) 2014-11-30 22:51:28
#92 Claude Vaillancourt (Cl3v3r) 1105 (44129) 2015-01-10 19:56:16
#93 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-15 19:58:56
#94 Shoukat (e195633) 1104 (10617) 2015-02-08 18:59:13
#95 Danny Higgins (hamster147) 1104 (39638) 2015-02-17 14:11:31
#96 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-03-08 13:25:24
#97 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 14:32:44
#98 R (r?) 1103 (6742) 2015-03-20 22:18:18
#99 Rainer Zufall (kiekuk) 1103 (56786) 2015-04-06 00:12:29
#100 D (devilchn) 1102 (11142) 2015-06-17 15:37:41
#101 Erik (Erox) 1101 (26141) 2015-07-15 23:13:28
#102 J-L Morel (Rossignol) 1101 (42130) 2015-07-29 16:59:53
#103 chris_3stones (3stones) 1101 (38845) 2015-08-06 15:23:52
#104 Sean (Kavanaugh) 1101 (29143) 2015-08-14 22:27:11
#105 Hans Joachim Girulat (joregi) 1100 (36278) 2015-10-23 22:42:46
#106 Scombes (jerva) 1100 (242717) 2015-10-25 09:47:05
#107 Alain Collignon (vexilla72) 1100 (123666) 2015-10-30 16:40:37
#108 Szabó Zoltán (szabo.z87) 1100 (55604) 2015-11-10 10:59:10
#109 Martin (martinbucher) 1100 (38365) 2015-11-14 13:12:06
#110 Dominik M. (Sgt. Pepper) 1099 (128575) 2015-12-22 13:28:15
#111 Casaubon (cfreuden) 1099 (8515) 2016-01-18 14:26:31
#112 Wolfgang (grauerwolf) 1098 (1098) 2016-01-29 07:49:16
#113 John (Block52) 1098 (1098) 2016-02-22 07:11:33
#114 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 17:19:30
#115 Peter (Garnet) 1097 (14234) 2016-04-22 16:52:14
#116 Andreas Frerichs (Ossili) 1097 (33266) 2016-04-27 19:15:03
#117 Norbert Biermann (Norbert) 1096 (47790) 2016-07-31 11:23:33
#118 CESH (cesh) 1096 (4995) 2016-08-19 22:52:12
#119 Flo (sealth) 1096 (25734) 2016-08-24 00:50:33
#120 Yeshwanth Bashyam (yeshbash) 1095 (1095) 2016-09-22 00:24:02
#121 Rajat Kabra (rajat kabra) 1095 (1195) 2016-09-22 01:07:19
#122 Nicolas (nicosPavlov) 1095 (257791) 2016-10-01 07:14:22
#123 ender (endered) 1095 (5478) 2016-11-20 06:56:03
#124 neko (neko) 1095 (7679) 2016-11-20 08:53:32
#125 JoGo (JoGo) 1095 (11686) 2016-12-05 13:00:01
#126 zuben c3 (zuben-c3) 1094 (42163) 2017-01-08 13:32:04
#127 Michael (FoM) 1094 (57794) 2017-01-26 08:39:13
#128 Tristan1473 (Tristan1473) 1094 (20432) 2017-02-04 11:43:44
#129 Georgius Stolte (HazmatsFear) 1094 (16071) 2017-02-11 17:02:55
#130 Mir Dim (mir0soft) 1093 (79760) 2017-03-14 13:53:15
#131 chris (c2) 1093 (51973) 2017-03-16 14:52:03
#132 Vaidotas (Hurrislt) 1093 (3579) 2017-03-20 20:29:16
#133 Kasia (kasia-tutej) 1093 (53366) 2017-05-30 13:46:28
#134 Mihail (plexor) 1092 (16827) 2017-06-12 14:38:01
#135 D3d4lu5 (D3d4lu5) 1092 (363488) 2017-06-13 19:45:04
#136 Imam Uasa (Merricx) 1092 (9188) 2017-06-17 23:56:02
#137 Akonia (Akonia12) 1092 (12153) 2017-07-19 20:35:29
#138 George Lasry (george4096) 1092 (399565) 2017-08-12 18:57:14
#139 Immo Weber (MandelToast) 1092 (10362) 2017-08-21 23:24:09
#140 Julian (Lemmynator) 1092 (20822) 2017-09-16 18:13:37
#141 Aijun (geaijun) 1090 (3479) 2018-01-07 11:49:33
#142 Tom Tox (tox) 1090 (17708) 2018-03-13 15:39:05
#143 Nofre Tete (noffi) 1090 (26507) 2018-03-15 00:44:28
#144 Godfrey Norton (Godfrey) 1090 (8162) 2018-03-16 08:15:08
#145 v3ct0r (V3ct0r_) 1090 (1291) 2018-04-05 18:47:38
#146 Eric (ExAstris) 1089 (56037) 2018-05-17 21:56:22
#147 Steve Vaillancourt (stvai2) 1089 (15041) 2018-06-01 03:07:39
#148 Random Dude (rnd) 1089 (103645) 2018-08-07 03:17:12
#149 Manfred Paul (manf) 1088 (14774) 2018-11-14 16:54:36
#150 kilink (kilink) 1087 (8053) 2019-01-22 11:48:26
#151 simone (xseris) 1087 (8632) 2019-02-16 11:28:34
#152 LoneWolf219 (LoneWolf219) 1087 (12795) 2019-03-08 05:49:22
#153 E41614031 (E41614031) 1087 (7526) 2019-03-09 11:59:41
#154 schwuggel1337 (schwuggel1337) 1087 (7716) 2019-03-20 19:24:21
#155 Will (nitrow) 1087 (6807) 2019-03-21 16:01:54
#156 Klaus (kumaus) 1087 (22017) 2019-04-01 14:11:52
#157 Lane Williams (planetlane) 1087 (34637) 2019-04-16 03:07:48
#158 Marco Cinelli (Snap) 1086 (37769) 2019-05-06 14:09:54
#159 Mike (RogueRamblers) 1086 (81614) 2019-05-27 16:43:01
#160 ENOENT (ENOENT) 1086 (13478) 2019-05-31 15:35:57
#161 Eugene (lim0n) 1086 (193160) 2019-06-21 14:02:32
#162 yult (yult) 1086 (12185) 2019-07-12 19:58:05
#163 Gerd Wilts (gerdw) 1086 (50634) 2019-07-13 09:27:00
#164 ajg (ludimus) 1086 (12114) 2019-07-23 10:23:48
#165 Dr. Peter Uelkes (RandyWaterhouse) 1086 (9990) 2019-08-03 07:30:38
#166 Stephan (Stephje1978) 1086 (27064) 2019-08-23 18:51:17
#167 Terence (tec) 1085 (8237) 2019-12-12 07:18:41
#168 Magata (fmagata) 1085 (11780) 2020-01-04 23:44:59
#169 LurkNoi (Lurkrul) 1084 (19595) 2020-02-18 15:37:09
#170 Artur Puzio (cytadela8) 1084 (14801) 2020-02-24 14:23:17
#171 Bernd (Elian) 1084 (3069) 2020-04-11 22:22:53
#172 DS (DS8279) 1083 (29732) 2020-07-01 16:55:23
#173 anomy (anomy) 1083 (3249) 2020-07-30 08:42:02
#174 mglarragan (mglarragan) 1083 (5067) 2020-08-10 12:02:12
#175 Polaris (Polaris) 1083 (32963) 2020-08-13 13:37:40
#176 Vinay (vinay27) 1083 (1083) 2020-09-11 14:39:21
#177 Costantino (Majakovskij) 1083 (9774) 2020-10-04 18:02:19
#178 Enigmatic (Enigmatic) 1083 (11604) 2020-10-29 18:58:16
#179 Nicky (Wokini) 1083 (18494) 2020-11-23 12:02:36
#180 Jean-Francois (Muskrat) 1082 (19013) 2021-01-09 21:07:26
#181 Alexander W. Janssen (itnomad) 1082 (10782) 2021-01-15 16:54:51
#182 amir (V5November) 1082 (13344) 2021-01-24 17:10:21
#183 m (umsyt) 1082 (9300) 2021-03-12 03:03:07
#184 madness (madness) 1082 (71592) 2021-04-17 20:59:23
#185 Roman Seefeld (Antares) 1081 (32880) 2021-07-09 15:06:48
#186 thatbusybeaver (thatbusybeaver) 1081 (12456) 2021-07-29 05:50:49
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   +++    [21:13 - 29.07.2021] thatbusybeaver solved the Level II challenge 'RSA Factoring Challenge: RSA-704'    +++    [20:41 - 29.07.2021] thatbusybeaver solved the Level II challenge 'Summer Job'    +++    [07:46 - 29.07.2021] thatbusybeaver solved the Level II challenge 'Enigma Part 1'    +++    [07:42 - 29.07.2021] thatbusybeaver solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [07:33 - 29.07.2021] thatbusybeaver solved the Level I challenge 'Letter to the Templars — Part 2'    +++