| Image Noise | 100 | March 13, 2022, 1:44 p.m. |
| Cryptanalysis Hacking Puzzles — Part 2 | 100 | Feb. 28, 2021, 8:37 p.m. |
| Snow White and the seven dwarfs | 100 | Feb. 6, 2021, 6:10 p.m. |
| Monoalphabetic Substitution | 100 | Feb. 6, 2021, 4:39 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Feb. 6, 2021, 2:30 p.m. |
| How do you become a big cryptographer? | 100 | Feb. 6, 2021, 2 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,084 | Jan. 29, 2021, 3:58 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,082 | Jan. 24, 2021, 5:10 p.m. |
| Alice's Birthday Party (Part 2) | 1,082 | Jan. 7, 2021, 7:02 p.m. |
| Alice's Birthday Party (Part 1) | 1,082 | Jan. 7, 2021, 6:07 p.m. |
| Factorization Cipher — Part 1 | 100 | Jan. 7, 2021, 5:37 p.m. |
| Advent-Challenge — Part 1 | 100 | Jan. 7, 2021, 5:31 p.m. |
| Cracking SHA1-Hashed Passwords | 1,083 | Jan. 7, 2021, 3:29 p.m. |
| Letter to the Templars — Part 3 | 1,087 | Jan. 7, 2021, 11:27 a.m. |
| Letter to the Templars — Part 2 | 100 | Jan. 6, 2021, 10:20 p.m. |
| Letter to the Templars — Part 1 | 100 | Jan. 6, 2021, 9:51 p.m. |