MysteryTwister C3
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Level II Challenges (135)

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

Polyphonic Substitution Cipher — Part 1

[tomokiyo-02] - 1 user already solved this challenge.
 
 
 

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

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

sarah b (silva) 2000 (28264) 2019-11-22 10:56:16
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Cipher ID — Part 1

[mistamp-01] - 5 users already solved this challenge, 3 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

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Rank User (#5) Achieved points (Global score) y-m-d - h:m:s

Bart den Hartog (Bart13) 2000 (147211) 2019-11-19 13:05:00
Viktor (Veselovský) 2000 (157163) 2019-11-19 14:41:45
D3d4lu5 (D3d4lu5) 2000 (299709) 2019-11-20 00:40:59
Armin Krauss (argh) 2000 (190214) 2019-11-20 10:40:28
#5 Eugene (lim0n) 1725 (70511) 2019-11-21 17:34:47
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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 (299709) 2019-08-26 00:10:35
Viktor (Veselovský) 2000 (157163) 2019-08-26 01:43:23
Snake (snk) 2000 (87405) 2019-08-26 01:58:38
Eugene (lim0n) 2000 (70511) 2019-08-26 12:30:26
#5 Kurt Gebauer (Yokozuna) 2000 (177433) 2019-08-26 15:17:12
#6 George (Theofanidis) 1576 (113380) 2019-08-31 00:32:21
#7 Alain Collignon (vexilla72) 1523 (96903) 2019-09-02 11:16:49
#8 sarah b (silva) 1523 (28264) 2019-09-02 13:12:48
#9 Armin Krauss (argh) 1523 (190214) 2019-09-02 18:56:22
#10 Bart den Hartog (Bart13) 1502 (147211) 2019-09-03 08:22:15
#11 George Lasry (george4096) 1385 (302230) 2019-09-14 13:17:41
#12 Random Dude (rnd) 1290 (97213) 2019-10-12 06:28:34
#13 Em Doulgerakis (Greko) 1252 (131437) 2019-11-08 13:51:58
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A Cloaked Substitution Cipher — Part 1

[kallick-26] - 14 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 1, the cipher uses a key which devides the ciphertext alphabet into signal characters and noise characters.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-08-21 12:05
Maximum number of attempts for this challenge: 15

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Rank User (#14) Achieved points (Global score) y-m-d - h:m:s

Snake (snk) 2000 (87405) 2019-08-21 19:03:44
D3d4lu5 (D3d4lu5) 2000 (299709) 2019-08-21 19:03:46
Michael Möller (michaelm) 2000 (175129) 2019-08-21 23:36:41
Eugene (lim0n) 1824 (70511) 2019-08-22 12:59:50
#5 Kurt Gebauer (Yokozuna) 1824 (177433) 2019-08-23 09:06:13
#6 Bart den Hartog (Bart13) 1725 (147211) 2019-08-24 00:59:12
#7 Viktor (Veselovský) 1660 (157163) 2019-08-24 17:35:25
#8 George (Theofanidis) 1660 (113380) 2019-08-24 19:27:39
#9 Armin Krauss (argh) 1576 (190214) 2019-08-26 16:24:17
#10 sarah b (silva) 1523 (28264) 2019-08-28 12:59:17
#11 Alain Collignon (vexilla72) 1444 (96903) 2019-09-02 15:05:22
#12 George Lasry (george4096) 1357 (302230) 2019-09-14 16:21:30
#13 Random Dude (rnd) 1286 (97213) 2019-10-10 02:25:14
#14 Em Doulgerakis (Greko) 1262 (131437) 2019-10-25 20:45:39
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The T52 Sturgeon Challenge — Part 12

[lasry-25] - 2 users already solved this challenge, 1 is working on it.
 
 
 

The Siemens and Halske T52 was a family of German teleprinter encryption devices used during WW2. This challenge is part of a series of challenges with T52. In this challenge, you need to recover the plaintext from a T52ca ciphertext. The key is partially known. You are also provided with a crib.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-08-10 17:32
Maximum number of attempts for this challenge: 15

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Rank User (#2) Achieved points (Global score) y-m-d - h:m:s

D3d4lu5 (D3d4lu5) 1660 (299709) 2019-08-14 16:54:59
Kurt Gebauer (Yokozuna) 1523 (177433) 2019-08-18 15:58:58
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   +++    [10:56 - 22.11.2019] silva solved the Level II challenge 'Polyphonic Substitution Cipher — Part 1'    +++    [10:31 - 22.11.2019] Wolkenwolf solved the Level I challenge 'Number Sequence — Part 4'    +++    [23:07 - 21.11.2019] Wolkenwolf solved the Level I challenge 'Number Sequence — Part 2'    +++    [19:11 - 21.11.2019] Wolkenwolf solved the Level I challenge 'Original Caesar Cipher'    +++    [19:08 - 21.11.2019] Wolkenwolf solved the Level I challenge 'A hidden word'    +++