| Homophonic Encryption — Part 1 | 1,824 | May 5, 2019, 10:43 p.m. |
| How do you become a big cryptographer? | 100 | Jan. 21, 2019, 8:05 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Jan. 21, 2019, 6:19 p.m. |
| Factorization Cipher — Part 1 | 100 | Jan. 20, 2019, 7:20 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Jan. 20, 2019, 6:48 p.m. |
| Pigpen with a twist — Part 3 | 1,090 | Jan. 20, 2019, 5:35 p.m. |
| Pigpen with a twist — Part 1 | 100 | Oct. 28, 2018, 10:36 p.m. |
| Autokey Cipher | 113 | Oct. 2, 2018, 10:50 p.m. |
| The Einstein Enigma | 1,576 | Feb. 12, 2018, 11:54 p.m. |
| Double Column Transposition — Part 4 | 1,108 | Feb. 11, 2018, 3:09 p.m. |
| Advent-Challenge — Part 1 | 133 | Dec. 11, 2017, 4:29 p.m. |
| Multilingual Monoalphabetic Substitution | 100 | Aug. 19, 2017, 2:20 p.m. |
| The Last Note | 100 | Aug. 11, 2017, 7:52 p.m. |
| ASAC — A Strong(er) ADFGVX Cipher — Part 1 | 1,204 | Dec. 5, 2016, 7:50 p.m. |
| Weakened Granit — Part 1 | 100 | Oct. 1, 2016, 9:28 p.m. |
| Double Column Transposition — Part 5 | 1,124 | Oct. 1, 2016, 2:15 p.m. |
| Number Sequence — Part 6 | 100 | Sept. 25, 2016, 8:22 p.m. |
| Number Sequence — Part 8 | 100 | Sept. 25, 2016, 8:20 p.m. |
| Number Sequence — Part 3 | 100 | Sept. 25, 2016, 8:15 p.m. |
| ¿No Hablas Español? No problemo! | 100 | Sept. 23, 2016, 6:43 p.m. |
| A really long number sequence | 1,103 | March 27, 2016, 11:57 p.m. |
| Number Sequence — Part 4 | 100 | March 25, 2016, 11:47 a.m. |
| Number Sequence — Part 2 | 100 | March 25, 2016, 11:11 a.m. |
| Number Sequence | 100 | March 25, 2016, 11 a.m. |
| Enigma Messages with Repeated Letters — Part 2 | 100 | March 16, 2016, 7:25 p.m. |
| Enigma Messages with Repeated Letters — Part 4 | 100 | March 16, 2016, 7:15 p.m. |
| Enigma Messages with Repeated Letters — Part 5 | 100 | March 14, 2016, 10:30 p.m. |
| Enigma Messages with Repeated Letters — Part 3 | 100 | March 14, 2016, 9:45 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | March 14, 2016, 9:23 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | March 14, 2016, 9:04 p.m. |
| Cracking SHA1-Hashed Passwords | 1,100 | March 14, 2016, 7:44 p.m. |
| Snow White and the seven dwarfs | 100 | March 13, 2016, 1:23 p.m. |
| Grille Cipher | 100 | March 13, 2016, 1 p.m. |
| Double Column Transposition — Part 1 | 1,130 | March 7, 2016, 12:02 a.m. |
| Monoalphabetic Substitution with Camouflage — Part 5 | 1,107 | March 3, 2016, 8:39 p.m. |
| Monoalphabetic substitution with camouflage — Part 3 | 1,105 | March 3, 2016, 12:01 a.m. |
| Monoalphabetic substitution with camouflage — Part 2 | 1,105 | Feb. 29, 2016, 1:39 a.m. |
| Double Column Transposition — Part 3 | 1,134 | Jan. 31, 2016, 11:34 a.m. |
| Double Column Transposition — Part 2 | 1,135 | Jan. 20, 2016, 6:07 p.m. |
| From Russia with Love | 100 | Jan. 19, 2016, 4:42 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Jan. 18, 2016, 11:56 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Jan. 18, 2016, 10:59 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | Jan. 18, 2016, 10:15 p.m. |
| ADFGVX — Part 2 | 100 | Jan. 18, 2016, 4:16 p.m. |
| ADFGVX — Part 1 | 100 | Jan. 18, 2016, 3:48 p.m. |
| Modified Caesar Cipher | 100 | Jan. 17, 2016, 10:53 p.m. |
| Letter to the Templars — Part 3 | 1,112 | Jan. 17, 2016, 8:06 p.m. |
| Letter to the Templars — Part 2 | 100 | Jan. 17, 2016, 6:44 p.m. |
| Letter to the Templars — Part 1 | 100 | Jan. 17, 2016, 6:31 p.m. |
| Caesar Encryption | 100 | Jan. 17, 2016, 2:54 a.m. |
| Playfair Encryption | 100 | Jan. 12, 2016, 10:06 p.m. |
| Playfair with hints about the grid | 100 | Jan. 12, 2016, 9:27 p.m. |
| Cascading Encryption — Part 1/3 | 100 | Jan. 10, 2016, 10:39 p.m. |
| Double Columnar Transposition | 100 | Jan. 10, 2016, 9:33 p.m. |
| Molehunt (Part 3/3) | 1,099 | Jan. 9, 2016, 2:11 a.m. |
| Molehunt (Part 2/3) | 100 | Jan. 3, 2016, 6:46 p.m. |
| Molehunt (Part 1/3) | 100 | Jan. 3, 2016, 6:17 p.m. |
| Monoalphabetic Substitution | 100 | Jan. 3, 2016, 5:08 p.m. |
| Nils away on travel | 100 | Jan. 3, 2016, 3:39 p.m. |
| Beaver Code | 100 | Jan. 3, 2016, 2:34 p.m. |
| A hidden word | 100 | Jan. 2, 2016, 7:36 p.m. |
| Original Caesar Cipher | 100 | Dec. 29, 2015, 8:21 p.m. |
| A hidden word — Part 2 | 100 | Dec. 27, 2015, 9:01 p.m. |
| A Secret Message from Castle Mansfeld | 100 | Dec. 27, 2015, 3:25 p.m. |
| News from Castle Mansfeld | 102 | Dec. 27, 2015, 3:22 p.m. |
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