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Level II Challenges (160)

Page 5 of the challenges in Level II, ordered by date posted (the most recent appear first).

The SIGABA Challenge — Part 1

[lasry-26] - 9 users already solved this challenge, 1 is working on it.
 
 
 

The SIGABA was a highly secure encryption machine used by the US for strategic communications in WWII. It is believed that the German codebreakers were unable to make any inroads against SIGABA. In this part of the series of challenges, you are provided with a partial known-plaintext, and some information about the key settings.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2020-02-29 12:29
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

Scombes (jerva) 2000 (266541) 2020-02-29 17:14:45
Dominik M. (Sgt. Pepper) 1576 (128575) 2020-03-06 02:41:04
Kurt Gebauer (Yokozuna) 1523 (282608) 2020-03-08 05:38:58
Snake (snk) 1373 (187783) 2020-03-21 14:15:47
#5 D3d4lu5 (D3d4lu5) 1349 (363488) 2020-03-26 17:55:38
#6 Nicolas (nicosPavlov) 1198 (257791) 2020-08-13 13:47:40
#7 Eugene (lim0n) 1190 (195334) 2020-09-06 18:11:16
#8 Em Doulgerakis (Greko) 1153 (193799) 2021-04-06 09:39:40
#9 Michael Möller (michaelm) 1140 (256593) 2021-08-31 21:40:28
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The LoRa Cipher: Logic Randomness — Part 1

[theofanidis-10] - 19 users already solved this challenge.
 
 
 

LoRa calculates the ciphertext by using a logic expression as key. The ciphertext unusually contains large bitstreams too. Could you find the logic expression from a given ciphertext?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2020-02-19 20:31
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#19) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (169444) 2020-02-19 22:35:21
Kurt Gebauer (Yokozuna) 2000 (282608) 2020-02-20 02:32:51
Dominik M. (Sgt. Pepper) 2000 (128575) 2020-02-20 04:28:34
Eugene (lim0n) 2000 (195334) 2020-02-20 08:26:23
#5 Alain Collignon (vexilla72) 2000 (123666) 2020-02-20 08:50:23
#6 madness (madness) 2000 (71592) 2020-02-20 16:41:35
#7 Snake (snk) 2000 (187783) 2020-02-20 17:26:23
#8 Armin Krauss (argh) 2000 (206965) 2020-02-20 20:27:17
#9 Derek Hatton (alfred_noble) 1613 (33998) 2020-02-24 17:03:34
#10 Mir Dim (mir0soft) 1576 (79760) 2020-02-25 07:51:23
#11 pcback (langkhach11112) 1502 (4860) 2020-02-28 16:00:00
#12 H. Lautenschlager (helmi) 1444 (57600) 2020-03-03 18:52:35
#13 George Lasry (george4096) 1330 (422251) 2020-03-21 21:04:03
#14 sarah b (silva) 1327 (52424) 2020-03-23 08:49:21
#15 D3d4lu5 (D3d4lu5) 1244 (363488) 2020-05-12 23:50:49
#16 Marco Cinelli (Snap) 1230 (37769) 2020-05-30 15:17:23
#17 Em Doulgerakis (Greko) 1164 (193799) 2020-12-29 16:24:22
#18 Luigi Tomelli (archstanton) 1147 (127538) 2021-05-25 18:35:49
#19 Eric (ExAstris) 1147 (56037) 2021-05-26 03:14:48
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Differential Cryptanalysis — Part 2

[kopal-bender-02] - 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 second challenge requires filtering.
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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: 2020-01-28 15:22
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) 2000 (195334) 2020-01-29 05:52:19
Dominik M. (Sgt. Pepper) 2000 (128575) 2020-01-29 11:13:43
Kurt Gebauer (Yokozuna) 1824 (282608) 2020-01-30 00:15:28
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Polyphonic Substitution Cipher — Part 2

[tomokiyo-03] - 17 users already solved this challenge.
 
 
 

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 (#17) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (282608) 2020-01-14 20:46:51
Snake (snk) 2000 (187783) 2020-01-14 21:48:19
Eugene (lim0n) 2000 (195334) 2020-01-15 11:18:08
George Lasry (george4096) 1824 (422251) 2020-01-16 00:47:13
#5 sarah b (silva) 1523 (52424) 2020-01-22 11:31:33
#6 George (Theofanidis) 1284 (132517) 2020-03-04 21:43:19
#7 madness (madness) 1281 (71592) 2020-03-07 13:38:01
#8 Thomas (Thomas4897) 1273 (36141) 2020-03-11 18:43:43
#9 Dominik M. (Sgt. Pepper) 1256 (128575) 2020-03-24 18:22:46
#10 Viktor (Veselovský) 1251 (169444) 2020-03-29 18:09:04
#11 D3d4lu5 (D3d4lu5) 1222 (363488) 2020-05-06 18:17:24
#12 Alain Collignon (vexilla72) 1177 (123666) 2020-09-14 01:19:07
#13 Martin (martinbucher) 1165 (38365) 2020-11-18 16:11:41
#14 Michael (FoM) 1161 (57794) 2020-12-12 23:30:41
#15 Em Doulgerakis (Greko) 1153 (193799) 2021-02-21 22:39:40
#16 Luigi Tomelli (archstanton) 1146 (127538) 2021-05-06 13:33:01
#17 Eric (ExAstris) 1144 (56037) 2021-05-24 00:45:44
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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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Click here to download the challenge.
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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 (195334) 2019-12-26 16:31:43
Kurt Gebauer (Yokozuna) 1523 (282608) 2019-12-30 03:08:38
Dominik M. (Sgt. Pepper) 1456 (128575) 2020-01-03 18:30:14
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   +++    [16:58 - 27.09.2021] Surtees solved the Level I challenge 'Number Sequence — Part 2'    +++    [14:53 - 27.09.2021] jenniferdecastro solved the Level I challenge 'A hidden word'    +++    [14:28 - 27.09.2021] Mercer solved the Level II challenge 'Cracking SHA1-Hashed Passwords'    +++    [09:52 - 26.09.2021] CRYbaby solved the Level I challenge 'How do you become a big cryptographer?'    +++    [17:29 - 25.09.2021] gemmath solved the Level I challenge 'Letter to the Templars — Part 1'    +++