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Level I Challenges

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Challenge "Modified Vigenère Cipher"
By: admin on Jan. 24, 2022, 11:56 a.m.
5
4499
By: Theofanidis  
July 11, 2022, 3:06 p.m.
Challenge "Alberti Challenge - Part 1"
By: admin on March 26, 2022, 8:45 p.m.
1
1240
By: seafischer  
June 3, 2022, 1:51 p.m.
Challenge "Heartbleed — Part 2"
By: admin on Aug. 28, 2014, 2:34 p.m.
11
15231
By: robot.txt  
May 17, 2022, 8:46 a.m.
Challenge "Heartbleed — Part 1"
By: admin on Aug. 28, 2014, 2:32 p.m.
9
11183
By: robot.txt  
May 17, 2022, 8:43 a.m.
Challenge "Trifid Cipher"
By: admin on Oct. 28, 2013, 8:49 p.m.
4
6845
By: BOBTMSJ  
May 10, 2022, 11:28 p.m.
Challenge "Polyhomophonic Substitution — Part 1"
By: admin on March 22, 2020, 1:57 a.m.
3
1890
By: seafischer  
April 28, 2022, 8:34 p.m.
Challenge "ECDH-Key Exchange for Beginners"
By: admin on Feb. 24, 2012, 12:02 a.m.
9
21901
By: RandyWaterhouse  
April 14, 2022, 1:10 p.m.
Challenge "Lightweight Introduction to Lattices — Part 1"
By: admin on May 16, 2020, 4:03 p.m.
2
2143
By: RandyWaterhouse  
Feb. 10, 2022, 12:59 p.m.
Challenge "¿No Hablas Español? No problemo!"
By: admin on April 18, 2012, 7:22 p.m.
2
14319
By: Theofanidis  
Jan. 16, 2022, 12:09 p.m.
Challenge "Playfair Encryption"
By: admin on Dec. 22, 2010, 7:48 a.m.
9
16734
By: RandyWaterhouse  
Dec. 3, 2021, 7:51 a.m.
Challenge "Find the right route — Part 3"
By: admin on Dec. 26, 2020, 6:24 p.m.
7
3614
By: Bart13  
Sept. 24, 2021, 12:36 p.m.
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Challenge "Classical Ciphers^3"
By: admin on May 7, 2010, 1:23 p.m.
19
62230
By: nbr90  
May 19, 2021, 4:32 p.m.
Challenge "Lightweight Introduction to Lattices — Part 2"
By: admin on June 23, 2020, 11:05 p.m.
8
3603
By: sir5  
May 19, 2021, 7:33 a.m.
Challenge "Number Sequence — Part 9"
By: admin on Nov. 16, 2017, 5:43 p.m.
4
3504
By: ExAstris  
May 7, 2021, 6:03 p.m.
Challenge "Autokey Cipher"
By: admin on Sept. 25, 2018, 2:21 p.m.
1
2124
By: Konubixe  
May 4, 2021, 10:14 p.m.
Challenge "Zodiac Cipher"
By: admin on Aug. 2, 2010, 4:12 p.m.
9
18540
By: tryone144  
March 26, 2021, 1:12 p.m.
Challenge "Find the right route — Part 1"
By: admin on Oct. 27, 2020, 5:01 p.m.
2
1688
By: Konubixe  
March 25, 2021, 5:51 p.m.
[  Go to the page:  1, 2  ]
Challenge "Number Sequence — Part 5"
By: admin on April 18, 2012, 7:30 p.m.
22
42787
By: Konubixe  
March 22, 2021, 4:08 p.m.
Challenge "Enigma Messages with Repeated Letters — Part 1"
By: admin on Sept. 26, 2013, 3:05 p.m.
3
5736
By: madness  
Feb. 22, 2021, 3:47 a.m.
[  Go to the page:  1, 2  ]
Challenge "Grille Cipher"
By: admin on Oct. 14, 2011, 6:04 p.m.
17
29736
By: Theofanidis  
Feb. 20, 2021, 5:07 p.m.
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