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Level I Challenges (82)

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

ECDH-Key Exchange for Beginners

[meier-02] - 81 users already solved this challenge, 2 are working on it.
 
 
 

Alice and Bob would like to agree upon a shared key. They use an Elliptic Curve Diffie-Hellman (ECDH) key-exchange protocol. Try to reproduce the steps that are necessary to calculate the key and to decrypt Bob's message.
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Published on: 2012-02-24 00:00
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#81) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 200 (151602) 2012-02-24 01:30:57
Bart den Hartog (Bart13) 200 (139176) 2012-02-24 05:01:51
Seth Kintigh (DarkFibre) 200 (79471) 2012-02-24 05:50:55
Armin Krauss (argh) 200 (185115) 2012-02-24 08:50:00
#5 Hans Peter (hanspeter) 200 (52256) 2012-02-24 10:54:50
#6 J. M. (jomandi) 200 (113270) 2012-02-24 13:48:27
#7 dbuq (dbuq) 200 (22762) 2012-02-24 15:06:14
#8 Nathan (Witten) 150 (25326) 2012-02-25 00:13:09
#9 Roland Jansen (roland) 133 (17607) 2012-02-26 16:55:27
#10 Lukas (Kahla) 133 (4719) 2012-02-26 21:45:36
#11 Luigi Tomelli (archstanton) 120 (108345) 2012-02-28 09:14:45
#12 Julius Sewing (H3BX) 120 (332) 2012-02-28 13:29:44
#13 Michel Van Caneghem (vancan) 120 (49719) 2012-02-28 22:05:39
#14 Daniel Fretwell (fretty) 120 (30107) 2012-02-28 23:48:52
#15 Thomas Lambert (lambert) 108 (35237) 2012-03-07 15:10:35
#16 bubba gump (surrenderyourworld) 104 (925) 2012-03-18 17:02:14
#17 Steluta P. (maty_star) 102 (5734) 2012-04-06 00:15:40
#18 Roxana Ioana (rock_sana) 102 (610) 2012-04-11 10:22:19
#19 Aliazer (Aliazer) 102 (12314) 2012-04-13 12:10:20
#20 George (Theofanidis) 102 (109124) 2012-04-16 23:44:55
#21 captp (bdcht) 101 (5864) 2012-05-09 09:53:00
#22 Kurt Gebauer (Yokozuna) 101 (175433) 2012-05-11 00:40:26
#23 E.T (Ertheb) 101 (81809) 2012-05-24 13:27:12
#24 Dusan (xxdradus) 101 (40236) 2012-05-27 12:14:30
#25 Daniel Richter (TheHiveMind) 101 (11147) 2012-06-19 09:50:04
#26 Em Doulgerakis (Greko) 101 (124033) 2012-07-06 16:40:21
#27 chris_3stones (3stones) 101 (37759) 2012-08-19 09:16:38
#28 KW (qwer*) 101 (13963) 2012-09-03 19:42:54
#29 H. Lautenschlager (helmi) 100 (32947) 2012-10-06 16:16:12
#30 Friedrich Wiemer (asante) 100 (5183) 2012-11-04 22:56:25
#31 Andrew (Agromania) 100 (4508) 2012-11-15 10:13:02
#32 fabian (faru) 100 (300) 2013-02-06 23:17:19
#33 Kirill (ineaugh) 100 (1920) 2013-03-25 00:17:47
#34 RPH (derichard) 100 (27044) 2013-04-12 10:10:01
#35 Vlatiha Romanova (Vlatiha) 100 (10323) 2013-06-27 11:21:01
#36 Carsten Hess (machess) 100 (700) 2013-07-27 11:05:23
#37 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-08-08 20:31:11
#38 Almut (problelmo) 100 (45992) 2013-08-19 16:36:54
#39 Geoffrey (FreshGod) 100 (2163) 2013-08-28 11:00:06
#40 Alexander (cruachan) 100 (16051) 2013-10-01 23:25:08
#41 Gergely Simon (george314) 100 (16555) 2013-10-02 20:53:40
#42 Steve (Samacian) 100 (23804) 2013-10-29 06:48:28
#43 Snake (snk) 100 (79889) 2013-11-20 17:48:27
#44 Brad (braddrew) 100 (15878) 2013-12-14 10:34:24
#45 Alain (Integral) 100 (207924) 2013-12-28 09:19:16
#46 Pavel (haw) 100 (22728) 2014-01-06 15:01:25
#47 Forrest Gump (Polyphem) 100 (38763) 2014-01-24 17:53:22
#48 caesar ([caesar]) 100 (10738) 2014-03-24 10:39:27
#49 Karl Schutt (günter) 100 (41550) 2014-04-01 21:40:10
#50 Robert (rm) 100 (56475) 2014-07-31 22:50:40
#51 Julia Bernotat (El Greco ) 100 (81129) 2014-08-04 17:50:29
#52 Sebastian Slupina (Grandwizard) 100 (10866) 2014-10-13 17:07:17
#53 Francisco Moraes (fmoraes) 100 (90044) 2014-11-03 22:27:16
#54 Andreas Frerichs (Ossili) 100 (33266) 2015-01-06 15:49:00
#55 HolgerK (HolgerK) 100 (25776) 2015-01-10 20:55:29
#56 Javantea (Javantea) 100 (40816) 2015-01-23 00:32:25
#57 Rainer Zufall (kiekuk) 100 (56786) 2015-05-07 12:06:18
#58 Fabio (degrigis) 100 (1206) 2015-07-15 18:04:03
#59 Erik (Erox) 100 (26141) 2015-08-28 13:09:21
#60 Claude Vaillancourt (Cl3v3r) 100 (38351) 2015-09-18 20:13:54
#61 S (Zyphe) 100 (10461) 2015-10-26 12:49:19
#62 Alain Collignon (vexilla72) 100 (87833) 2015-11-03 06:03:14
#63 Martin (martinbucher) 100 (27363) 2016-01-02 11:18:48
#64 Lane Williams (planetlane) 100 (23948) 2016-01-25 21:28:42
#65 Dominik M. (Sgt. Pepper) 100 (97919) 2016-10-02 14:52:04
#66 Nicolas (nicosPavlov) 100 (151166) 2016-10-15 06:56:38
#67 Marcel (bene1512) 100 (20896) 2016-12-30 09:38:22
#68 Michael (FoM) 100 (38953) 2017-01-13 14:36:58
#69 Simon Hemmerich (simhem) 100 (3779) 2017-03-13 11:06:49
#70 chris (c2) 100 (51973) 2017-04-25 14:28:55
#71 Mir Dim (mir0soft) 100 (72404) 2017-05-25 13:56:06
#72 Felix (Flix) 100 (13712) 2017-05-30 21:52:08
#73 Kasia (kasia-tutej) 100 (53366) 2017-06-06 14:44:49
#74 D3d4lu5 (D3d4lu5) 100 (295709) 2017-06-25 08:59:49
#75 john doe (misio) 100 (7371) 2017-12-04 21:45:15
#76 Eric (ExAstris) 100 (26990) 2018-05-27 22:10:35
#77 Random Dude (rnd) 100 (90929) 2018-07-17 03:06:07
#78 Ekrem Aydin (Eko115) 100 (1105) 2018-10-27 17:07:50
#79 madness (madness) 100 (15407) 2019-04-01 18:53:59
#80 ENOENT (ENOENT) 100 (13478) 2019-06-01 20:58:17
#81 Darth Thucydides (darththucydides) 100 (500) 2019-06-27 05:54:40
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