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Level III Challenges (66)

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

Handycipher — Part 4

[kallick-12] - 4 users already solved this challenge.
 
 
 

Handycipher is a newly created cipher designed to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. Part 4 is the same as Part 1, but uses an improved version of the cipher. You are given the ciphertext and the first 229 letters of the plaintext.
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Published on: 2016-06-28 19:50
Maximum number of attempts for this challenge: 15

All successful users of this challenge

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

Alain (Integral) 15684 (207924) 2016-08-15 21:12:28
George Lasry (george4096) 14276 (308769) 2017-05-29 00:06:01
Nicolas (nicosPavlov) 13928 (151166) 2018-03-03 03:12:00
D3d4lu5 (D3d4lu5) 13748 (338576) 2018-11-05 06:48:23
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   +++    [21:04 - 10.04.2020] snk solved the Level II challenge 'ORYX Stream Cipher Part I'    +++    [20:06 - 10.04.2020] bubblesort solved the Level II challenge 'Broadcasting and low exponent — RSA-Attack'    +++    [19:55 - 10.04.2020] bubblesort solved the Level I challenge 'M-138 — Part 1'    +++    [19:45 - 10.04.2020] bubblesort solved the Level I challenge 'Reserve Hand Procedure — Part 1'    +++    [19:17 - 10.04.2020] bubblesort solved the Level I challenge 'How do you become a big cryptographer?'    +++