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Level II Challenges (153)

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

Lightweight Introduction to Lattices — Part 3

[dimitrov-esslinger-03] - 20 users already solved this challenge.
 
 
 

This is part 3 of the challenge series about lattice-based cryptography schemes. This challenge introduces an encryption scheme which uses systems of linear equations. Can you decrypt a message without knowing the key?
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Published on: 2020-07-16 12:58
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#20) Achieved points (Global score) y-m-d - h:m:s

Dominik M. (Sgt. Pepper) 2000 (127349) 2020-07-16 13:39:08
S (Zyphe) 2000 (13361) 2020-07-16 14:13:42
Kurt Gebauer (Yokozuna) 2000 (274906) 2020-07-16 14:34:01
H. Lautenschlager (helmi) 2000 (56270) 2020-07-16 14:42:10
#5 Snake (snk) 2000 (187650) 2020-07-16 15:07:38
#6 Viktor (Veselovský) 2000 (169244) 2020-07-16 22:00:42
#7 Eugene (lim0n) 2000 (170873) 2020-07-16 22:58:02
#8 Armin Krauss (argh) 2000 (206664) 2020-07-17 12:56:08
#9 Alain Collignon (vexilla72) 1824 (122384) 2020-07-17 18:39:14
#10 George (Theofanidis) 1824 (119711) 2020-07-17 19:54:10
#11 Silvia Kortmann (mikinsget) 1824 (16559) 2020-07-18 10:43:30
#12 Em Doulgerakis (Greko) 1725 (140695) 2020-07-19 11:13:43
#13 Nofre Tete (noffi) 1613 (26357) 2020-07-20 20:20:30
#14 DS (DS8279) 1576 (29732) 2020-07-22 12:14:13
#15 Derek Hatton (alfred_noble) 1406 (33998) 2020-08-01 17:46:10
#16 Marco Cinelli (Snap) 1324 (34364) 2020-08-18 16:34:40
#17 Tristan1473 (Tristan1473) 1315 (20432) 2020-08-22 12:53:25
#18 Polaris (Polaris) 1305 (32963) 2020-08-26 01:34:05
#19 Michael (FoM) 1201 (53292) 2020-12-21 03:51:15
#20 D3d4lu5 (D3d4lu5) 1198 (363488) 2020-12-29 19:46:17
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   +++    [05:30 - 28.01.2021] Alex Loaf of Bread solved the Level I challenge 'Original Caesar Cipher'    +++    [05:02 - 28.01.2021] Alex Loaf of Bread solved the Level I challenge 'Number Sequence'    +++    [23:12 - 27.01.2021] lakis solved the Level II challenge 'M-138 — Part 4'    +++    [17:43 - 27.01.2021] doctor_funkenstein solved the Level I challenge 'A modified homophonic cipher with reduced alphabets — Part 2'    +++    [17:03 - 27.01.2021] doctor_funkenstein solved the Level I challenge 'A modified homophonic cipher with reduced alphabets — Part 1'    +++