MysteryTwister C3
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Level II Challenges (153)

Page 13 of the challenges in Level II, ordered by date posted (the most recent appear first).

Holographic Encryption — Part 1

[pavillon-01] - 6 users already solved this challenge.
 
 
 

Holographic encryption can be performed by employing encryption masks which alter the field before propagation. This makes the image unrecognizable when recorded. You are given three holograms that represent the cipher image and two corrupted encryption masks.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-04-07 22:25
Maximum number of attempts for this challenge: 15

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Rank User (#6) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 1660 (169244) 2017-04-11 09:41:56
Armin Krauss (argh) 1456 (206664) 2017-04-19 17:59:59
Bart den Hartog (Bart13) 1198 (148936) 2017-09-20 03:18:52
D3d4lu5 (D3d4lu5) 1124 (359988) 2019-07-21 16:07:09
#5 Eugene (lim0n) 1120 (169787) 2019-11-08 18:32:36
#6 Kurt Gebauer (Yokozuna) 1117 (274906) 2020-02-03 08:16:13
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Hilly — Part 1

[almardeny-01] - 8 users already solved this challenge, 5 are working on it.
 
 
 

Hilly is an improved version of the Hill cipher. This challenge consists of the decryption of a ciphertext by means of a given plaintext-ciphertext pair.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-01-25 04:09
Maximum number of attempts for this challenge: 15

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

Viktor (Veselovský) 1385 (169244) 2017-02-13 19:33:24
Dominik M. (Sgt. Pepper) 1142 (127349) 2018-07-03 02:17:21
Alain (Integral) 1142 (207924) 2018-07-03 19:30:44
Alain Collignon (vexilla72) 1141 (122384) 2018-07-14 09:53:00
#5 Em Doulgerakis (Greko) 1139 (137134) 2018-08-07 11:17:55
#6 D3d4lu5 (D3d4lu5) 1127 (359988) 2019-03-06 17:05:47
#7 Eugene (lim0n) 1120 (169787) 2019-09-04 14:38:53
#8 Bart den Hartog (Bart13) 1119 (148936) 2019-09-19 07:08:40
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ASAC — A Strong(er) ADFGVX Cipher — Part 5

[fendt-05] - 0 users already solved this challenge.
 
 
 

This series consists of 5 challenges based on each other. It introduces a new three-step cipher called ASAC, which is a modified version of ADFGVX. Part 5 is a "bonus" and just modifies the second challenge of this series by improving the second step of the cipher.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2016-07-09 19:15
Maximum number of attempts for this challenge: 15

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ASAC — A Strong(er) ADFGVX Cipher — Part 4

[fendt-04] - 0 users already solved this challenge.
 
 
 

This series consists of 5 challenges based on each other. It introduces a new three-step cipher called ASAC, which is a modified version of ADFGVX. Part 4 uses the complete cipher and is the main challenge of this series.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2016-07-09 19:13
Maximum number of attempts for this challenge: 15

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ASAC — A Strong(er) ADFGVX Cipher — Part 3

[fendt-03] - 0 users already solved this challenge.
 
 
 

This series consists of 5 challenges based on each other. It introduces a new three-step cipher called ASAC, which is a modified version of ADFGVX. Part 3 involves the complete cipher but weakens the third step by using a single-column transposition instead of a double column transposition.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2016-07-09 19:10
Maximum number of attempts for this challenge: 15

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   +++    [20:03 - 16.01.2021] Cubitus solved the Level I challenge 'Original Caesar Cipher'    +++    [16:31 - 16.01.2021] V5November solved the Level I challenge 'Autokey Cipher'    +++    [15:44 - 16.01.2021] itnomad solved the Level I challenge 'Number Sequence — Part 8'    +++    [14:12 - 16.01.2021] itnomad solved the Level I challenge 'Advent-Challenge — Part 1'    +++    [11:33 - 16.01.2021] Rossignol solved the Level II challenge 'Double Column Transposition — Part 2'    +++