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Level II Challenges (158)

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

A Cloaked Substitution Cipher — Part 1

[kallick-26] - 15 users already solved this challenge.
 
 
 

Like the MONOALPHABETIC SUBSTITUTION WITH CAMOUFLAGE series of challenges, this two-part challenge considers a modification of the classic simple substitution cipher achieved by randomly introducing decoy characters into the ciphertext in encryption which are then ignored in decryption. In part 1, the cipher uses a key which devides the ciphertext alphabet into signal characters and noise characters.
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Published on: 2019-08-21 12:05
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#15) Achieved points (Global score) y-m-d - h:m:s

Snake (snk) 2000 (187783) 2019-08-21 19:03:44
D3d4lu5 (D3d4lu5) 2000 (363488) 2019-08-21 19:03:46
Michael Möller (michaelm) 2000 (253196) 2019-08-21 23:36:41
Eugene (lim0n) 1824 (178540) 2019-08-22 12:59:50
#5 Kurt Gebauer (Yokozuna) 1824 (282608) 2019-08-23 09:06:13
#6 Bart den Hartog (Bart13) 1725 (148936) 2019-08-24 00:59:12
#7 Viktor (Veselovský) 1660 (169444) 2019-08-24 17:35:25
#8 George (Theofanidis) 1660 (123216) 2019-08-24 19:27:39
#9 Armin Krauss (argh) 1576 (206965) 2019-08-26 16:24:17
#10 sarah b (silva) 1523 (49171) 2019-08-28 12:59:17
#11 Alain Collignon (vexilla72) 1444 (123666) 2019-09-02 15:05:22
#12 George Lasry (george4096) 1357 (399565) 2019-09-14 16:21:30
#13 Random Dude (rnd) 1286 (103645) 2019-10-10 02:25:14
#14 Em Doulgerakis (Greko) 1262 (193799) 2019-10-25 20:45:39
#15 madness (madness) 1193 (71592) 2020-02-19 04:28:42
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   +++    [11:11 - 24.06.2021] bestwishes solved the Level I challenge 'Number Sequence — Part 6'    +++    [11:01 - 24.06.2021] E01814058 solved the Level II challenge 'Alice's Birthday Party (Part 1)'    +++    [10:57 - 24.06.2021] E01814058 solved the Level II challenge 'Heartbleed — Part 3'    +++    [10:56 - 24.06.2021] bestwishes solved the Level I challenge 'Find the right route — Part 1'    +++    [10:54 - 24.06.2021] smf12 solved the Level I challenge 'Find the right route — Part 1'    +++