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Level II Challenges (146)

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

Not-so-Secret Message from Malawi — Part II (ECC)

[schaefer-02] - 34 users already solved this challenge, 3 are working on it.
 
 
 

It is also important to choose the parameters of an elliptic curve cryptosystem wisely. This was not done in this example, which should enable you to decrypt another ciphertext message from Malawi. The plaintext reveals the codeword, although this time it is not as closely related to the photo.
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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 (#34) Achieved points (Global score) y-m-d - h:m:s

Cezary Glowacz (cezaryglowacz) 1576 (9995) 2010-10-19 17:20:21
Ulrich Armbrüster (uarmbruester) 1414 (7987) 2010-10-29 20:08:00
Flip (Flip) 1222 (31107) 2011-02-04 00:26:45
Armin Krauss (argh) 1216 (202814) 2011-02-14 16:01:41
#5 Wolfgang Weisser (wowmyst) 1209 (33108) 2011-03-02 01:51:28
#6 J. M. (jomandi) 1179 (113270) 2011-06-07 00:19:02
#7 Viktor (Veselovský) 1169 (168147) 2011-07-27 17:16:22
#8 Daniel Fretwell (fretty) 1169 (30107) 2011-07-28 13:00:03
#9 The Killer (Killer) 1152 (42393) 2011-11-28 01:29:31
#10 Keith Randall (randall77) 1151 (31011) 2011-12-05 19:03:10
#11 Luigi Tomelli (archstanton) 1143 (113164) 2012-03-04 20:45:58
#12 Aliazer (Aliazer) 1140 (12314) 2012-04-19 22:15:47
#13 Michel Van Caneghem (vancan) 1138 (49719) 2012-05-18 09:29:50
#14 Bart den Hartog (Bart13) 1134 (148936) 2012-07-17 13:35:26
#15 Christian (Etschupu) 1134 (31788) 2012-07-19 15:13:25
#16 Thomas Lambert (lambert) 1132 (38594) 2012-08-22 18:48:04
#17 RPH (derichard) 1121 (27044) 2013-04-17 00:00:47
#18 Em Doulgerakis (Greko) 1118 (133365) 2013-07-17 14:15:08
#19 Kurt Gebauer (Yokozuna) 1117 (260506) 2013-08-17 22:40:10
#20 zahir mohsen moradi (ariobarzan) 1116 (99757) 2013-09-13 23:04:52
#21 Alain (Integral) 1113 (207924) 2014-01-09 17:32:40
#22 Forrest Gump (Polyphem) 1112 (38763) 2014-02-18 22:55:00
#23 Francisco Moraes (fmoraes) 1106 (90044) 2014-11-20 19:52:23
#24 Ben Ward (bward) 1101 (2519) 2015-08-01 22:54:14
#25 Martin (martinbucher) 1098 (30103) 2016-03-22 12:29:12
#26 Dominik M. (Sgt. Pepper) 1095 (124749) 2016-10-05 22:14:50
#27 T (Wagner) 1093 (16988) 2017-05-10 07:57:03
#28 Kasia (kasia-tutej) 1092 (53366) 2017-06-15 23:59:04
#29 Mir Dim (mir0soft) 1092 (79760) 2017-07-30 07:42:44
#30 Nicolas (nicosPavlov) 1090 (166643) 2018-02-04 08:07:45
#31 kilink (kilink) 1087 (8053) 2019-01-22 15:43:59
#32 D3d4lu5 (D3d4lu5) 1087 (343788) 2019-02-26 18:04:45
#33 schwuggel1337 (schwuggel1337) 1087 (7716) 2019-03-21 13:55:08
#34 Eugene (lim0n) 1085 (124450) 2019-10-27 11:04:21
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   +++    [03:02 - 11.08.2020] noother solved the Level III challenge 'RSA Factoring Challenge: RSA-250'    +++    [02:53 - 11.08.2020] noother solved the Level II challenge 'RSA Factoring Challenge: RSA-210'    +++    [23:37 - 10.08.2020] Polaris solved the Level I challenge 'Hill Cipher with Sudoku Key'    +++    [22:17 - 10.08.2020] Polaris solved the Level II challenge 'Broadcasting and low exponent — RSA-Attack'    +++    [18:51 - 10.08.2020] Polaris solved the Level II challenge 'Alice's Birthday Party (Part 2)'    +++