| Number Sequence — Part 10 | 109 | April 28, 2018, 11:07 p.m. |
| M-138 — Part 2 | 1,113 | March 21, 2018, 4:07 p.m. |
| M-138 — Part 1 | 100 | March 21, 2018, 3:40 p.m. |
| The Last Note | 100 | March 21, 2018, 3:36 p.m. |
| How do you become a big cryptographer? | 100 | March 21, 2018, 3:28 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | Dec. 26, 2017, 11:07 p.m. |
| ADFGVX — Part 2 | 100 | Dec. 25, 2017, 12:10 a.m. |
| ADFGVX — Part 1 | 100 | Dec. 24, 2017, 10:33 p.m. |
| ¿No Hablas Español? No problemo! | 100 | Dec. 23, 2017, 11:40 p.m. |
| A hidden word — Part 2 | 100 | Dec. 23, 2017, 10:45 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | Nov. 29, 2017, 12:40 a.m. |
| The Book Code: A Challenge for Bookworms | 100 | Nov. 27, 2017, 10:10 p.m. |
| Number Sequence — Part 7 | 100 | Nov. 27, 2017, 6:15 p.m. |
| Nils away on travel | 100 | Nov. 23, 2017, 8:28 p.m. |
| Classical Ciphers^3 | 100 | Nov. 23, 2017, 7:50 p.m. |
| From Russia with Love | 100 | Nov. 21, 2017, 10:57 p.m. |
| One-Time Pad with Flaws | 100 | Nov. 21, 2017, 8:20 p.m. |
| Snow White and the seven dwarfs | 100 | Nov. 21, 2017, 7:25 p.m. |
| Grille Cipher | 100 | Nov. 21, 2017, 6:44 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Nov. 21, 2017, 5:12 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Nov. 21, 2017, 4:45 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Nov. 18, 2017, 9:11 p.m. |
| Factorization Cipher — Part 1 | 100 | Nov. 18, 2017, 6:53 p.m. |
| Modified Caesar Cipher | 100 | Nov. 18, 2017, 5:45 p.m. |
| Monoalphabetic Substitution | 100 | Nov. 18, 2017, 11:40 a.m. |
| Letter to the Templars — Part 3 | 1,099 | Nov. 16, 2017, 10:57 p.m. |
| Letter to the Templars — Part 2 | 100 | Nov. 16, 2017, 10:47 p.m. |
| Letter to the Templars — Part 1 | 100 | Nov. 16, 2017, 10:40 p.m. |
| A hidden word | 100 | Nov. 16, 2017, 10:10 p.m. |
| Caesar Encryption | 100 | Nov. 16, 2017, 10:01 p.m. |
| Beaver Code | 100 | Nov. 16, 2017, 9:42 p.m. |
| Original Caesar Cipher | 100 | Nov. 16, 2017, 8:36 p.m. |
| Number Sequence — Part 4 | 100 | Nov. 16, 2017, 8:19 p.m. |
| Number Sequence — Part 8 | 100 | Nov. 16, 2017, 8:11 p.m. |
| Number Sequence — Part 6 | 100 | Nov. 16, 2017, 8:07 p.m. |
| Number Sequence — Part 9 | 200 | Nov. 16, 2017, 7:39 p.m. |
| Number Sequence — Part 3 | 100 | Nov. 16, 2017, 7:34 p.m. |
| Number Sequence — Part 2 | 100 | Nov. 16, 2017, 7:31 p.m. |
| Number Sequence | 100 | Nov. 16, 2017, 7:29 p.m. |