MysteryTwister C3
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Level II Challenges (103)

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

Advent Challenge — Part 3

[rotthaler-05] - 16 users already solved this challenge.
 
 
 

What do you do, if your father and your stepmother decide to communicate only encrypted? You tape-record the messages. But what do the two of them really talk about?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-12-22 18:19
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

Viktor (Veselovský) 2000 (121516) 2017-12-22 19:30:50
Dominik M. (Sgt. Pepper) 2000 (54049) 2017-12-22 19:31:05
Alain Collignon (vexilla72) 2000 (57657) 2017-12-22 19:34:58
Kurt Gebauer (Yokozuna) 2000 (131741) 2017-12-22 19:43:48
#5 D3d4lu5 (D3d4lu5) 2000 (73077) 2017-12-22 19:44:19
#6 H. Lautenschlager (helmi) 2000 (26409) 2017-12-22 21:36:12
#7 Snake (snk) 2000 (59265) 2017-12-22 21:41:17
#8 Mir Dim (mir0soft) 2000 (56071) 2017-12-23 08:43:02
#9 S Combes (jerva) 2000 (81932) 2017-12-23 10:37:20
#10 Armin Krauss (argh) 1824 (162834) 2017-12-23 21:23:45
#11 Em Doulgerakis (Greko) 1824 (113859) 2017-12-24 12:12:44
#12 Rainer Zufall (kiekuk) 1576 (47286) 2017-12-28 16:21:44
#13 Ronja (Ronja) 1576 (3715) 2017-12-28 17:00:41
#14 E.T (Ertheb) 1456 (59391) 2018-01-03 17:42:31
#15 Nicolas (nicosPavlov) 1444 (80131) 2018-01-04 07:56:07
#16 Martin (martinbucher) 1423 (27363) 2018-01-06 11:17:17
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Advent Challenge — Part 4

[rotthaler-06] - 16 users already solved this challenge.
 
 
 

Decrypting a Christmas carol to help children in need? It's not that easy, if you don't know much about cryptography. Can you help Jacob and the children?
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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: 2017-12-21 17:06
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

Viktor (Veselovský) 2000 (121516) 2017-12-21 18:47:44
Michael Möller (michaelm) 2000 (120945) 2017-12-21 19:14:17
Kurt Gebauer (Yokozuna) 2000 (131741) 2017-12-21 19:56:48
S Combes (jerva) 2000 (81932) 2017-12-21 22:27:59
#5 H. Lautenschlager (helmi) 2000 (26409) 2017-12-21 23:30:50
#6 Dominik M. (Sgt. Pepper) 2000 (54049) 2017-12-22 01:43:42
#7 Alain Collignon (vexilla72) 2000 (57657) 2017-12-22 08:16:18
#8 D3d4lu5 (D3d4lu5) 1824 (73077) 2017-12-22 20:43:46
#9 Ronja (Ronja) 1824 (3715) 2017-12-22 22:59:42
#10 J-L Morel (Rossignol) 1824 (29125) 2017-12-23 09:15:19
#11 Mir Dim (mir0soft) 1824 (56071) 2017-12-23 11:56:52
#12 Armin Krauss (argh) 1725 (162834) 2017-12-23 23:50:55
#13 Rainer Zufall (kiekuk) 1547 (47286) 2017-12-28 14:16:36
#14 Snake (snk) 1502 (59265) 2017-12-29 21:06:52
#15 Nicolas (nicosPavlov) 1433 (80131) 2018-01-04 07:57:46
#16 E.T (Ertheb) 1423 (59391) 2018-01-04 18:37:28
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AES ECB Wrong Encoding

[miro-01] - 8 users already solved this challenge.
 
 
 

Do you believe that AES is easy to break because of a wrong encoding? Try it yourself...
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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: 2017-12-16 19:21
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#8) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (121516) 2017-12-17 18:10:22
Snake (snk) 1824 (59265) 2017-12-17 21:48:12
Armin Krauss (argh) 1824 (162834) 2017-12-17 23:34:09
Kurt Gebauer (Yokozuna) 1824 (131741) 2017-12-18 13:16:26
#5 Kasia (kasia-tutej) 1613 (45961) 2017-12-21 16:40:57
#6 D3d4lu5 (D3d4lu5) 1523 (73077) 2017-12-24 04:30:18
#7 Dominik M. (Sgt. Pepper) 1523 (54049) 2017-12-24 17:46:24
#8 H. Lautenschlager (helmi) 1423 (26409) 2017-12-31 18:15:33
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Advent-Challenge — Part 2

[rotthaler-04] - 21 users already solved this challenge.
 
 
 

Mike would like to belong to the cryptographers. Can you help him to find out their meeting point at the Christmas market?
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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: 2017-12-16 19:20
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#21) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (131741) 2017-12-17 00:20:59
Dominik M. (Sgt. Pepper) 2000 (54049) 2017-12-17 06:30:45
Alain Collignon (vexilla72) 2000 (57657) 2017-12-17 11:20:39
Viktor (Veselovský) 2000 (121516) 2017-12-17 12:30:11
#5 Snake (snk) 2000 (59265) 2017-12-17 13:08:04
#6 HolgerK (HolgerK) 1824 (25776) 2017-12-17 21:40:33
#7 Armin Krauss (argh) 1824 (162834) 2017-12-17 23:35:23
#8 H. Lautenschlager (helmi) 1824 (26409) 2017-12-18 16:07:50
#9 Em Doulgerakis (Greko) 1824 (113859) 2017-12-18 16:55:03
#10 Rainer Zufall (kiekuk) 1725 (47286) 2017-12-19 18:36:20
#11 Mir Dim (mir0soft) 1660 (56071) 2017-12-20 14:38:38
#12 J-L Morel (Rossignol) 1660 (29125) 2017-12-20 15:48:19
#13 Kasia (kasia-tutej) 1613 (45961) 2017-12-21 14:27:23
#14 Martin (martinbucher) 1613 (27363) 2017-12-21 16:34:55
#15 D3d4lu5 (D3d4lu5) 1576 (73077) 2017-12-22 14:54:56
#16 chris_3stones (3stones) 1469 (36146) 2017-12-26 20:14:01
#17 George (Theofanidis) 1469 (90564) 2017-12-26 20:17:25
#18 T (Wagner) 1433 (16887) 2017-12-30 08:51:23
#19 Nicolas (nicosPavlov) 1414 (80131) 2018-01-01 12:24:40
#20 E.T (Ertheb) 1406 (59391) 2018-01-02 18:16:51
#21 j.h. (haegarq) 1357 (13159) 2018-01-10 11:36:25
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Hilly — Part 2

[almardeny-02] - 0 users already solved this challenge.
 
 
 

Hilly is an improved version of Hill cipher. This challenge consists of the decryption of a ciphertext by means of a partly-known 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: 2017-10-17 17:12
Maximum number of attempts for this challenge: 15

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   +++    [02:27 - 23.01.2018] nicosPavlov solved the Level II challenge 'Weakened Handycipher — Part 3'    +++    [22:57 - 22.01.2018] lzn solved the Level I challenge 'Advent-Challenge — Part 1'    +++    [18:16 - 22.01.2018] Yokozuna solved the Level II challenge 'Kaskade-S/T — Part 6 (RansomKaskade Part 1)'    +++    [11:41 - 22.01.2018] nicosPavlov solved the Level II challenge 'Weakened Handycipher — Part 2'    +++    [22:31 - 21.01.2018] stormguard solved the Level I challenge 'Number Sequence'    +++