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Level II Challenges (158)

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

SIGABA CSP-889 — Part 2

[kopal-26] - 2 users already solved this challenge.
 
 
 

The SIGABA CSP-889 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided with a ciphertext and a partially-known plaintext, here with the length of 270 and 120 characters.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2021-06-01 13:35
Maximum number of attempts for this challenge: 15

All successful users of this challenge

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

Scombes (jerva) 1824 (242717) 2021-06-03 06:45:44
George Lasry (george4096) 1613 (399565) 2021-06-05 14:08:00
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SIGABA CSP-889 — Part 1

[kopal-25] - 2 users already solved this challenge.
 
 
 

The SIGABA CSP-889 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided with a ciphertext and a partially-known plaintext, here with the length of 320 and 120 characters.

Update June 2021: We replaced the used key (and this changed the ciphertext) since a part of the previous used key was leaked in the newest SIGABA template of CrypTool 2.
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Click here to get to the corresponding forum topic to share your opinion.
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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: 2021-06-01 13:18
Maximum number of attempts for this challenge: 15

All successful users of this challenge

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

Scombes (jerva) 2000 (242717) 2021-06-02 10:40:32
George Lasry (george4096) 1725 (399565) 2021-06-03 22:50:04
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Wheatstone Cryptograph — Part 2

[madness-05] - 4 users already solved this challenge.
 
 
 

The Wheatstone Cryptograph is a simple device that resembles a clock with two hands. For each hand there is a ring of symbols. In this challenge the key is a random permutation of the english alphabet. Are you able to decrypt the given ciphertext?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2021-05-21 15:10
Maximum number of attempts for this challenge: 30

All successful users of this challenge

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

Eugene (lim0n) 2000 (193160) 2021-05-21 19:56:41
Kurt Gebauer (Yokozuna) 2000 (282608) 2021-05-22 01:51:39
George Lasry (george4096) 1547 (399565) 2021-05-27 21:18:02
sarah b (silva) 1324 (49171) 2021-06-23 15:32:31
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The SZ42 Challenge — Part 11

[kopal-24] - 3 users already solved this challenge, 1 is working on it.
 
 
 

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the eleventh challenge in a series of 13 level-2 challenges with the SZ42. In this "key breaking" challenge you are provided with one ciphertext and the corresponding plaintext. Can you find the wheel patterns?
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Click here to get to the corresponding forum topic to share your opinion.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2021-01-30 15:48
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

George Lasry (george4096) 1385 (399565) 2021-02-19 14:58:08
Kurt Gebauer (Yokozuna) 1307 (282608) 2021-03-11 11:39:16
Eugene (lim0n) 1269 (193160) 2021-04-01 08:15:04
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The SZ42 Challenge — Part 10

[kopal-23] - 3 users already solved this challenge.
 
 
 

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the tenth challenge in a series of 13 level-2 challenges with the SZ42. In this "key breaking" challenge you are provided with one ciphertext and the corresponding plaintext. Can you find the wheel patterns?
Update January 2021: The starting positions for the CHI wheels were added.
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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: 2021-01-30 15:40
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 (193160) 2021-01-30 17:18:00
Kurt Gebauer (Yokozuna) 2000 (282608) 2021-01-30 17:40:00
George Lasry (george4096) 1660 (399565) 2021-02-02 19:40:00
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   +++    [21:13 - 29.07.2021] thatbusybeaver solved the Level II challenge 'RSA Factoring Challenge: RSA-704'    +++    [20:41 - 29.07.2021] thatbusybeaver solved the Level II challenge 'Summer Job'    +++    [07:46 - 29.07.2021] thatbusybeaver solved the Level II challenge 'Enigma Part 1'    +++    [07:42 - 29.07.2021] thatbusybeaver solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [07:33 - 29.07.2021] thatbusybeaver solved the Level I challenge 'Letter to the Templars — Part 2'    +++