MysteryTwister C3
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Level II Challenges (107)

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

Trendy Messenger

[minihold-03] - 16 users already solved this challenge, 1 is working on it.
 
 
 

Sniffing on the WiFi, you notice an ElGamal encrypted message. Are you able to compute it?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-06-12 13:26
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#16) Achieved points (Global score) y-m-d - h:m:s

D3d4lu5 (D3d4lu5) 2000 (83780) 2018-06-13 01:04:34
Kurt Gebauer (Yokozuna) 2000 (139941) 2018-06-13 11:25:42
Dominik M. (Sgt. Pepper) 1824 (69138) 2018-06-13 14:33:57
Viktor (Veselovský) 1725 (128689) 2018-06-14 19:05:40
#5 Alain Collignon (vexilla72) 1547 (69578) 2018-06-19 07:44:33
#6 George (Theofanidis) 1523 (99668) 2018-06-19 19:26:48
#7 Vlad (Vlad94) 1523 (1523) 2018-06-19 20:50:56
#8 Teodoru catalin Andrei (teodoru) 1502 (5698) 2018-06-20 16:01:04
#9 Eric (ExAstris) 1469 (26990) 2018-06-22 16:47:20
#10 E.T (Ertheb) 1456 (68387) 2018-06-23 14:51:57
#11 Christophe BORELLY (cb34) 1433 (12358) 2018-06-25 13:53:33
#12 Silvia Kortmann (mikinsget) 1406 (10104) 2018-06-29 10:26:04
#13 Armin Krauss (argh) 1398 (168849) 2018-06-29 14:25:48
#14 Nicolas (nicosPavlov) 1330 (149564) 2018-07-13 16:23:13
#15 Mihail (plexor) 1327 (16827) 2018-07-14 19:56:05
#16 Alain (Integral) 1307 (208924) 2018-07-21 13:53:14
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Fastest in the West

[minihold-01] - 16 users already solved this challenge.
 
 
 

Buying a train ticket via credit card should not be a problem — actually. Can you solve the subset-sum problem to get your train?
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Click here to get to the corresponding forum topic to share your opinion.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-06-12 13:24
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#16) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (139941) 2018-06-13 03:24:07
D3d4lu5 (D3d4lu5) 2000 (83780) 2018-06-13 07:45:23
Alain Collignon (vexilla72) 2000 (69578) 2018-06-13 10:36:19
Dominik M. (Sgt. Pepper) 1824 (69138) 2018-06-14 13:22:36
#5 Viktor (Veselovský) 1725 (128689) 2018-06-14 16:21:58
#6 George (Theofanidis) 1660 (99668) 2018-06-15 20:11:16
#7 E.T (Ertheb) 1576 (68387) 2018-06-17 22:53:05
#8 Diaconu Bogdan (bogdan_walle) 1523 (1723) 2018-06-19 16:36:32
#9 Teodoru catalin Andrei (teodoru) 1502 (5698) 2018-06-20 15:58:58
#10 Eric (ExAstris) 1485 (26990) 2018-06-21 18:56:13
#11 Alain (Integral) 1485 (208924) 2018-06-22 00:15:18
#12 Snake (snk) 1469 (65457) 2018-06-22 22:48:21
#13 Armin Krauss (argh) 1398 (168849) 2018-06-29 15:27:43
#14 Nicolas (nicosPavlov) 1391 (149564) 2018-07-01 04:20:26
#15 Christophe BORELLY (cb34) 1385 (12358) 2018-07-02 11:31:03
#16 george lasry (george4096) 1367 (285484) 2018-07-04 23:19:04
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Summer Job

[minihold-02] - 17 users already solved this challenge, 2 are working on it.
 
 
 

During your summer job in an Austrian weekly magazine a mysterious letter arrives. Are you able to decrypt the message?
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Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-06-12 13:16
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#17) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (139941) 2018-06-12 21:37:26
E.T (Ertheb) 2000 (68387) 2018-06-12 21:48:19
Viktor (Veselovský) 2000 (128689) 2018-06-12 23:34:15
D3d4lu5 (D3d4lu5) 2000 (83780) 2018-06-13 06:19:26
#5 Alain Collignon (vexilla72) 1824 (69578) 2018-06-13 15:53:42
#6 Dominik M. (Sgt. Pepper) 1725 (69138) 2018-06-14 22:17:14
#7 George (Theofanidis) 1613 (99668) 2018-06-17 11:54:19
#8 John Smith (Froyo10) 1547 (1747) 2018-06-18 20:24:50
#9 Teodoru catalin Andrei (teodoru) 1502 (5698) 2018-06-20 15:57:16
#10 Eric (ExAstris) 1485 (26990) 2018-06-22 04:38:27
#11 Alain (Integral) 1469 (208924) 2018-06-23 10:16:28
#12 Silvia Kortmann (mikinsget) 1433 (10104) 2018-06-26 01:36:50
#13 Armin Krauss (argh) 1406 (168849) 2018-06-28 20:33:36
#14 george lasry (george4096) 1367 (285484) 2018-07-04 22:04:09
#15 Snake (snk) 1330 (65457) 2018-07-13 21:05:10
#16 Nicolas (nicosPavlov) 1327 (149564) 2018-07-15 05:49:19
#17 Mihail (plexor) 1324 (16827) 2018-07-16 09:04:57
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Weakened ElsieFour — Part 2

[rotthaler-08] - 0 users already solved this challenge.
 
 
 

The challenges for the weakened ElsieFour serve as an exercise and use an intentionally weakened version of LC4. ElsieFour combines ideas of modern RC4 stream cipher, historical Playfair cipher and plaintext-dependent keystreams. It can be computed manually. Part 2 is a partly-known key challenge which provides 12 consecutive characters of the key.
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Click here to download the challenge.
Click here to download the additional file of the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-04-28 16:36
Maximum number of attempts for this challenge: 15

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Weakened ElsieFour — Part 1

[rotthaler-07] - 1 user already solved this challenge, 1 is working on it.
 
 
 

The challenges for the weakened ElsieFour serve as an exercise and use an intentionally weakened version of LC4. ElsieFour combines ideas of modern RC4 stream cipher, historical Playfair cipher and plaintext-dependent keystreams. It can be computed manually. Part 1 is a partly-known key challenge which provides the first 12 characters of the key.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.
Click here to download the additional file of the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-04-28 16:29
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#1) Achieved points (Global score) y-m-d - h:m:s

Michael Möller (michaelm) 1242 (151619) 2018-07-22 21:17:29
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   +++    [04:01 - 23.07.2018] rnd solved the Level I challenge 'Image Noise'    +++    [21:17 - 22.07.2018] michaelm solved the Level II challenge 'Weakened ElsieFour — Part 1'    +++    [14:50 - 22.07.2018] netcom solved the Level I challenge 'Advent-Challenge — Part 1'    +++    [23:06 - 21.07.2018] arbacle solved the Level I challenge 'Monoalphabetic Substitution'    +++    [21:48 - 21.07.2018] arbacle solved the Level II challenge 'Letter to the Templars — Part 3'    +++