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Level II Challenges (162)

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

The SZ42 Challenge — Part 13

[kopal-32] - 3 users already solved this challenge.
 
 
 

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the last challenge in a series of 13 level-2 challenges with the SZ42. In this "key breaking" challenge you are provided with one ciphertext and parts of the corresponding plaintext. Can you find the MU wheel patterns and decrypt the ciphertext?
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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: 2021-10-06 11:51
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 (199334) 2021-10-07 08:44:19
Kurt Gebauer (Yokozuna) 1824 (286256) 2021-10-07 23:44:18
George (Theofanidis) 1725 (137118) 2021-10-08 23:29:26
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The SZ42 Challenge — Part 12

[kopal-31] - 3 users already solved this challenge.
 
 
 

The Lorenz SZ42, codenamed Tunny, was a German teleprinter encryption device used during WW2. This is the twelfth challenge in a series of 13 level-2 challenges with the SZ42. In this "key breaking" challenge you are provided with one ciphertext and parts of the corresponding plaintext. Can you find the PSI wheel patterns and decrypt the ciphertext?
Read more...

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: 2021-10-06 11:47
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 (199334) 2021-10-07 07:12:12
Kurt Gebauer (Yokozuna) 1824 (286256) 2021-10-07 22:19:09
George (Theofanidis) 1725 (137118) 2021-10-08 20:26:23
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SIGABA CSP-2900 — Part 2

[kopal-29] - 2 users already solved this challenge.
 
 
 

The SIGABA CSP-2900 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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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: 2021-07-31 17:58
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 (266541) 2021-08-01 15:13:45
George Lasry (george4096) 1725 (422251) 2021-08-03 06:31:59
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SIGABA CSP-2900 — Part 1

[kopal-28] - 2 users already solved this challenge.
 
 
 

The SIGABA CSP-2900 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.
Read more...

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: 2021-07-31 17:47
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 (266541) 2021-08-02 01:47:14
George Lasry (george4096) 1725 (422251) 2021-08-03 09:42:56
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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.
Read more...

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: 2021-06-01 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 (266541) 2021-06-03 06:45:44
George Lasry (george4096) 1613 (422251) 2021-06-05 14:08:00
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   +++    [22:12 - 18.10.2021] NikM solved the Level I challenge 'Wheatstone Cryptograph — Part 1'    +++    [18:43 - 18.10.2021] TaRaSS solved the Level I challenge 'Affine Codes / Modulo Arithmetic with N / Extended Euclid'    +++    [17:10 - 18.10.2021] tAnAs solved the Level I challenge 'Letter to the Templars — Part 2'    +++    [16:42 - 18.10.2021] TaRaSS solved the Level I challenge 'Beaver Code'    +++    [16:23 - 18.10.2021] TaRaSS solved the Level I challenge 'Number Sequence — Part 2'    +++