MysteryTwister C3
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Level II Challenges (137)

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

Polyphonic Substitution Cipher — Part 2

[tomokiyo-03] - 4 users already solved this challenge, 1 is working on it.
 
 
 

This is part two of the two polyphonic cipher challenges, where again two or more plaintext letters correspond to one cipher symbol. Can you solve such a cipher?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2020-01-14 15:20
Maximum number of attempts for this challenge: 10

All successful users of this challenge

Rank User (#4) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (184116) 2020-01-14 20:46:51
Snake (snk) 2000 (93659) 2020-01-14 21:48:19
Eugene (lim0n) 2000 (79941) 2020-01-15 11:18:08
George Lasry (george4096) 1824 (307439) 2020-01-16 00:47:13
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Christmas Challenge 2019: Differential Cryptanalysis — Part 1

[kopal-bender-01] - 3 users already solved this challenge.
 
 
 

This challenge series introduces in detail the handling of the differential cryptanalysis (DCA). In the first two challenges you have to decrypt encrypted images and enter the code shown in the images. The first challenge needs no filtering, as only valid plaintext-ciphertext pairs are delivered.
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-12-22 21:04
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#3) Achieved points (Global score) y-m-d - h:m:s

Eugene (lim0n) 1660 (79941) 2019-12-26 16:31:43
Kurt Gebauer (Yokozuna) 1523 (184116) 2019-12-30 03:08:38
Dominik M. (Sgt. Pepper) 1456 (99375) 2020-01-03 18:30:14
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Polyphonic Substitution Cipher — Part 1

[tomokiyo-02] - 9 users already solved this challenge, 1 is working on it.
 
 
 

In a polyphonic cipher, two or more plaintext letters correspond to one ciphertext symbol.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-11-21 13:18
Maximum number of attempts for this challenge: 10

All successful users of this challenge

Rank User (#9) Achieved points (Global score) y-m-d - h:m:s

sarah b (silva) 2000 (28364) 2019-11-22 10:56:16
Bart den Hartog (Bart13) 1725 (148936) 2019-11-23 15:02:52
George Lasry (george4096) 1725 (307439) 2019-11-23 17:29:00
Snake (snk) 1725 (93659) 2019-11-23 21:47:29
#5 D3d4lu5 (D3d4lu5) 1725 (302572) 2019-11-23 22:47:12
#6 Kurt Gebauer (Yokozuna) 1547 (184116) 2019-11-28 02:28:03
#7 Eugene (lim0n) 1423 (79941) 2019-12-05 17:45:31
#8 Danny Higgins (hamster147) 1349 (39638) 2019-12-18 00:49:54
#9 Random Dude (rnd) 1337 (98550) 2019-12-20 18:42:25
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Cipher ID — Part 1

[mistamp-01] - 8 users already solved this challenge, 7 are working on it.
 
 
 

Determine which type of classic cipher was used to generate each of 500 ciphertext messages. The ciphers used in this challenge are simple substitution, columnar transposition, Vigenère, Playfair, and Hill.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-11-19 12:00
Maximum number of attempts for this challenge: 20

All successful users of this challenge

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

Bart den Hartog (Bart13) 2000 (148936) 2019-11-19 13:05:00
Viktor (Veselovský) 2000 (157163) 2019-11-19 14:41:45
D3d4lu5 (D3d4lu5) 2000 (302572) 2019-11-20 00:40:59
Armin Krauss (argh) 2000 (190214) 2019-11-20 10:40:28
#5 Eugene (lim0n) 1725 (79941) 2019-11-21 17:34:47
#6 George Lasry (george4096) 1660 (307439) 2019-11-22 23:30:33
#7 Kurt Gebauer (Yokozuna) 1613 (184116) 2019-11-23 22:20:16
#8 Snake (snk) 1444 (93659) 2019-12-02 11:48:55
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A Cloaked Substitution Cipher — Part 2

[kallick-27] - 13 users already solved this challenge.
 
 
 

Like the MONOALPHABETIC SUBSTITUTION WITH CAMOUFLAGE series of challenges, this two-part challenge considers a modification of the classic simple substitution cipher achieved by randomly introducing decoy characters into the ciphertext in encryption which are then ignored in decryption. In part 2, the plaintext is first divided into two parts, then each part will be encrypted separately.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-08-25 19:26
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#13) Achieved points (Global score) y-m-d - h:m:s

D3d4lu5 (D3d4lu5) 2000 (302572) 2019-08-26 00:10:35
Viktor (Veselovský) 2000 (157163) 2019-08-26 01:43:23
Snake (snk) 2000 (93659) 2019-08-26 01:58:38
Eugene (lim0n) 2000 (79941) 2019-08-26 12:30:26
#5 Kurt Gebauer (Yokozuna) 2000 (184116) 2019-08-26 15:17:12
#6 George (Theofanidis) 1576 (113380) 2019-08-31 00:32:21
#7 Alain Collignon (vexilla72) 1523 (111210) 2019-09-02 11:16:49
#8 sarah b (silva) 1523 (28364) 2019-09-02 13:12:48
#9 Armin Krauss (argh) 1523 (190214) 2019-09-02 18:56:22
#10 Bart den Hartog (Bart13) 1502 (148936) 2019-09-03 08:22:15
#11 George Lasry (george4096) 1385 (307439) 2019-09-14 13:17:41
#12 Random Dude (rnd) 1290 (98550) 2019-10-12 06:28:34
#13 Em Doulgerakis (Greko) 1252 (131437) 2019-11-08 13:51:58
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   +++    [20:26 - 17.01.2020] HansW solved the Level I challenge 'Letter to the Templars — Part 1'    +++    [19:28 - 17.01.2020] HansW solved the Level I challenge 'Original Caesar Cipher'    +++    [19:14 - 17.01.2020] HansW solved the Level I challenge 'Number Sequence — Part 2'    +++    [19:10 - 17.01.2020] HansW solved the Level I challenge 'Number Sequence'    +++    [15:22 - 17.01.2020] Kruxi solved the Level II challenge 'Letter to the Templars — Part 3'    +++