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Level II Challenges (160)

Page 14 of the challenges in Level II, ordered by date posted (the most recent appear first).

Kaskade-S/T — Part 6 (RansomKaskade Part 1)

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

From a honeypot you get a set of encrypted files and the according plaintext files. Could you discover the used key, to help victims of the ransom ware?
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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: 2017-07-02 12:32
Maximum number of attempts for this challenge: 15

All successful users of this challenge

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

Armin Krauss (argh) 1444 (206965) 2017-07-14 14:00:35
Michael Möller (michaelm) 1344 (256593) 2017-07-29 12:39:20
Kurt Gebauer (Yokozuna) 1186 (282608) 2018-01-22 18:16:47
George Lasry (george4096) 1156 (422251) 2018-07-08 22:27:49
#5 Alain Collignon (vexilla72) 1142 (123666) 2018-12-02 20:00:09
#6 D3d4lu5 (D3d4lu5) 1131 (363488) 2019-05-19 12:39:50
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Holographic Encryption — Part 2

[pavillon-02] - 3 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 three plain images and their holograms which were encrypted with the same 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 22:29
Maximum number of attempts for this challenge: 15

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

Viktor (Veselovský) 1613 (169444) 2017-04-12 18:46:17
Armin Krauss (argh) 1444 (206965) 2017-04-20 17:54:38
Eugene (lim0n) 1120 (195334) 2019-11-16 13:49:41
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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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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: 2017-04-07 22:25
Maximum number of attempts for this challenge: 15

All successful users of this challenge

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

Viktor (Veselovský) 1660 (169444) 2017-04-11 09:41:56
Armin Krauss (argh) 1456 (206965) 2017-04-19 17:59:59
Bart den Hartog (Bart13) 1198 (148936) 2017-09-20 03:18:52
D3d4lu5 (D3d4lu5) 1124 (363488) 2019-07-21 16:07:09
#5 Eugene (lim0n) 1120 (195334) 2019-11-08 18:32:36
#6 Kurt Gebauer (Yokozuna) 1117 (282608) 2020-02-03 08:16:13
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Hilly — Part 1

[almardeny-01] - 9 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

All successful users of this challenge

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

Viktor (Veselovský) 1385 (169444) 2017-02-13 19:33:24
Dominik M. (Sgt. Pepper) 1142 (128575) 2018-07-03 02:17:21
Alain (Integral) 1142 (207924) 2018-07-03 19:30:44
Alain Collignon (vexilla72) 1141 (123666) 2018-07-14 09:53:00
#5 Em Doulgerakis (Greko) 1139 (193799) 2018-08-07 11:17:55
#6 D3d4lu5 (D3d4lu5) 1127 (363488) 2019-03-06 17:05:47
#7 Eugene (lim0n) 1120 (195334) 2019-09-04 14:38:53
#8 Bart den Hartog (Bart13) 1119 (148936) 2019-09-19 07:08:40
#9 Kurt Gebauer (Yokozuna) 1104 (282608) 2021-06-05 12:12:23
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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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   +++    [13:12 - 19.09.2021] Achidutzu solved the Level I challenge 'Enigma Messages'    +++    [11:38 - 16.09.2021] silva solved the Level II challenge 'Keyshanc — Part 2'    +++    [05:06 - 16.09.2021] gilotyna solved the Level I challenge 'Number Sequence — Part 2'    +++    [04:58 - 16.09.2021] gilotyna solved the Level I challenge 'Original Caesar Cipher'    +++    [04:49 - 16.09.2021] gilotyna solved the Level I challenge 'Number Sequence'    +++