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Level II Challenges (153)
Page 17 of the challenges in Level II, ordered by date posted (the most recent appear first).
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The challenges for the weakened Handycipher serve as an exercise and use an intentionally weakened version of Handycipher. Part 3 is a ciphertext-only challenge.
Handycipher is a newly designed cipher to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. 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.
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Author:
This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2015-05-13 11:49 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#14) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Kurt Gebauer (Yokozuna)
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2000 (274906) |
2015-05-13 21:52:11 |
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Armin Krauss (argh)
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1576 (206664) |
2015-05-18 14:55:24 |
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Julia Bernotat (El Greco )
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1485 (81129) |
2015-05-23 00:58:36 |
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S Combes (jerva)
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1444 (204567) |
2015-05-26 08:31:39 |
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#5 |
Alain (Integral)
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1357 (207924) |
2015-06-07 10:32:44 |
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#6 |
zahir mohsen moradi (ariobarzan)
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1216 (99757) |
2015-09-14 18:27:06 |
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#7 |
Michael Möller (michaelm)
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1216 (253046) |
2015-09-14 18:54:08 |
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#8 |
Em Doulgerakis (Greko)
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1152 (137134) |
2016-06-24 14:59:34 |
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#9 |
George Lasry (george4096)
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1128 (369910) |
2017-05-27 03:40:02 |
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#10 |
Nicolas (nicosPavlov)
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1119 (257791) |
2018-01-23 02:27:58 |
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#11 |
D3d4lu5 (D3d4lu5)
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1111 (359988) |
2018-10-27 06:27:48 |
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#12 |
Viktor (Veselovský)
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1108 (169244) |
2019-02-22 23:32:41 |
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#13 |
Danny Higgins (hamster147)
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1106 (39638) |
2019-05-08 16:05:36 |
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#14 |
Random Dude (rnd)
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1106 (98856) |
2019-06-15 03:11:22 |
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You must be logged in to solve the challenge |
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The challenges for the weakened Handycipher serve as an exercise and use an intentionally weakened version of Handycipher. Part 2 is a ciphertext-only challenge with a helping additional information.
Handycipher is a newly designed cipher to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. 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.
|
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2015-05-13 11:48 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#13) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Kurt Gebauer (Yokozuna)
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2000 (274906) |
2015-05-13 16:00:48 |
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Armin Krauss (argh)
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1523 (206664) |
2015-05-21 01:33:08 |
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Julia Bernotat (El Greco )
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1502 (81129) |
2015-05-21 18:04:20 |
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Alain (Integral)
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1357 (207924) |
2015-06-06 13:54:36 |
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#5 |
Michael Möller (michaelm)
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1220 (253046) |
2015-09-08 05:32:57 |
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#6 |
zahir mohsen moradi (ariobarzan)
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1216 (99757) |
2015-09-14 18:26:02 |
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#7 |
Em Doulgerakis (Greko)
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1155 (137134) |
2016-05-31 12:37:35 |
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#8 |
George Lasry (george4096)
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1128 (369910) |
2017-05-27 03:33:02 |
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#9 |
Nicolas (nicosPavlov)
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1119 (257791) |
2018-01-22 11:41:35 |
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#10 |
D3d4lu5 (D3d4lu5)
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1111 (359988) |
2018-10-27 06:26:19 |
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#11 |
Viktor (Veselovský)
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1108 (169244) |
2019-02-22 18:57:23 |
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#12 |
Danny Higgins (hamster147)
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1107 (39638) |
2019-05-06 18:37:41 |
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#13 |
Random Dude (rnd)
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1106 (98856) |
2019-06-14 00:42:27 |
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You must be logged in to solve the challenge |
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The challenges for the weakened Handycipher serve as an exercise and use an intentionally weakened version of Handycipher. Part 1 is a partially-known-plaintext challenge with a helping additional information.
Handycipher is a newly designed cipher to permit pen-and-paper encrypting and decrypting, while providing a significantly high level of security. 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.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2015-05-13 11:47 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#15) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Kurt Gebauer (Yokozuna)
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2000 (274906) |
2015-05-13 12:44:32 |
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Julia Bernotat (El Greco )
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1613 (81129) |
2015-05-17 18:02:13 |
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Armin Krauss (argh)
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1485 (206664) |
2015-05-22 19:32:50 |
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Alain (Integral)
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1362 (207924) |
2015-06-05 15:01:59 |
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#5 |
Michael Möller (michaelm)
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1235 (253046) |
2015-08-15 16:25:41 |
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#6 |
zahir mohsen moradi (ariobarzan)
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1229 (99757) |
2015-08-22 12:40:27 |
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#7 |
Karl Schutt (günter)
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1167 (44273) |
2016-03-07 05:20:49 |
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#8 |
Em Doulgerakis (Greko)
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1156 (137134) |
2016-05-18 13:14:59 |
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#9 |
George Lasry (george4096)
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1128 (369910) |
2017-05-28 22:01:31 |
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#10 |
Nicolas (nicosPavlov)
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1119 (257791) |
2018-01-19 02:26:13 |
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#11 |
D3d4lu5 (D3d4lu5)
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1111 (359988) |
2018-10-26 07:56:33 |
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#12 |
Viktor (Veselovský)
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1108 (169244) |
2019-02-22 19:24:31 |
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#13 |
Snake (snk)
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1108 (187650) |
2019-03-06 13:55:44 |
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#14 |
Danny Higgins (hamster147)
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1107 (39638) |
2019-05-02 09:21:44 |
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#15 |
Random Dude (rnd)
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1106 (98856) |
2019-06-25 00:12:17 |
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You must be logged in to solve the challenge |
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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. You got only two different ciphertexts of the 996-character plaintext. 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.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2015-03-27 15:28 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#3) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Michael Möller (michaelm)
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1183 (253046) |
2015-10-31 18:28:20 |
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George Lasry (george4096)
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1126 (369910) |
2017-05-31 10:24:36 |
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D3d4lu5 (D3d4lu5)
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1109 (359988) |
2018-11-16 17:12:39 |
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You must be logged in to solve the challenge |
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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 905-character plaintext 229 characters somewhere in it are known. 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.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2015-03-27 15:27 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#3) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Michael Möller (michaelm)
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1185 (253046) |
2015-10-23 09:07:20 |
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George Lasry (george4096)
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1126 (369910) |
2017-05-31 10:18:56 |
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D3d4lu5 (D3d4lu5)
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1109 (359988) |
2018-11-13 20:07:14 |
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You must be logged in to solve the challenge |
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