MysteryTwister C3
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Level III Challenges (72)

Page 3 of the challenges in Level III, ordered by date posted (the most recent appear first).

The Heavy T52 Sturgeon Challenge — Part 3

[kopal-07] - 2 users already solved this challenge, 1 is working on it.
 
 
 

The Siemens and Halske T52 was a family of German teleprinter encryption devices used during WW2. This challenge is part of a series of new heavier challenges with T52. In this challenge, you need to recover a plaintext from one T52C ciphertext. The key is unknown.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-10-26 18:50
Maximum number of attempts for this challenge: 15

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

S Combes (jerva) 14126 (204567) 2020-12-29 18:50:16
George Lasry (george4096) 14125 (369910) 2020-12-31 12:43:06
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The Heavy T52 Sturgeon Challenge — Part 2

[kopal-06] - 0 users already solved this challenge.
 
 
 

The Siemens and Halske T52 was a family of German teleprinter encryption devices used during WW2. This challenge is part of a series of new heavier challenges with T52. In this challenge, you need to recover a plaintext from one T52AB ciphertext. The key is unknown.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-10-09 12:36
Maximum number of attempts for this challenge: 15

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The Heavy T52 Sturgeon Challenge — Part 1

[kopal-05] - 1 user already solved this challenge.
 
 
 

The Siemens and Halske T52 was a family of German teleprinter encryption devices used during WW2. This challenge is part of a series of new heavier challenges with T52. In this challenge, you need to recover the plaintexts from T52D ciphertexts "in-depth". The key is unknown.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2019-09-30 17:57
Maximum number of attempts for this challenge: 15

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Rank User (#1) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 14576 (369910) 2020-04-25 19:03:07
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ElsieFour — Part 1

[rotthaler-01] - 3 users already solved this challenge, 1 is working on it.
 
 
 

ElsieFour combines ideas of modern RC4 stream cipher, historical Playfair cipher and plaintext-dependent keystreams. It can be computed manually. Part 1 is a partly-known-plaintext challenge which provides 2 messages that were encrypted with the same key.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-10-03 06:37
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

S Combes (jerva) 14436 (204567) 2018-06-18 22:14:19
Michael Möller (michaelm) 14182 (253046) 2018-10-29 13:09:48
D3d4lu5 (D3d4lu5) 13586 (363282) 2021-01-04 19:14:20
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Handycipher — Part 9

[kallick-23] - 3 users already solved this challenge, 1 is working on it.
 
 
 

Handycipher is a newly created cipher designed to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. Part 9 is the same as Part 6, but uses an improved version of the cipher. It is a ciphertext-only challenge.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-01-21 22:17
Maximum number of attempts for this challenge: 20

All successful users of this challenge

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

George Lasry (george4096) 14906 (369910) 2017-05-31 11:00:46
Michael Möller (michaelm) 14129 (253046) 2018-03-26 21:50:27
D3d4lu5 (D3d4lu5) 13830 (363282) 2019-01-26 17:57:14
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   +++    [12:30 - 22.01.2021] Muskrat solved the Level I challenge 'M-138 — Part 1'    +++    [22:55 - 21.01.2021] RYW solved the Level I challenge 'Number Sequence — Part 2'    +++    [22:51 - 21.01.2021] RYW solved the Level I challenge 'Original Caesar Cipher'    +++    [22:48 - 21.01.2021] Muhamad solved the Level I challenge 'Original Caesar Cipher'    +++    [22:11 - 21.01.2021] RYW solved the Level I challenge 'Number Sequence'    +++