Level II Challenges (139)
Page 1 of the challenges in
Level II, ordered by date posted (the most recent appear first).
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Extended Handycipher is an enhancement of the newly designed cipher Handycipher, which permits pen-and-paper encrypting and decrypting, while providing a significantly high level of security. From the 815-character plaintext the first 229 characters are known. Read more...
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Author:
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Published on: 2015-03-27 15:26 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
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User (#3) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Michael Möller (michaelm)
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1192 (184723) |
2015-09-27 11:51:38 |
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George Lasry (george4096)
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1126 (307439) |
2017-05-31 10:23:02 |
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D3d4lu5 (D3d4lu5)
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1109 (302572) |
2018-11-10 17:59:52 |
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