| Not-so-Secret Message from Malawi — Part I (RSA) | 1,078 | Jan. 19, 2023, 12:54 p.m. |
| The Syllabary Cipher – Part 1 | 104 | Nov. 23, 2022, 2:13 a.m. |
| RSA Factoring Challenge: RSA-220 | 0 | Sept. 20, 2022, 6:22 a.m. |
| ¿No Hablas Español? No problemo! | 100 | Sept. 17, 2022, 9:50 p.m. |
| M-138 — Part 2 | 1,089 | July 24, 2022, 10:44 a.m. |
| Number Sequence — Part 4 | 100 | July 12, 2022, 10:02 a.m. |
| RSA Factoring Challenge: RSA-230 | 0 | July 6, 2022, 9:50 a.m. |
| Enigma Messages | 100 | July 3, 2022, 3:44 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | July 3, 2022, 1:02 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | July 1, 2022, 9:26 p.m. |
| Alberti Challenge — Part 1 | 102 | May 18, 2022, 2:27 p.m. |
| RSA Factoring Challenge: RSA-210 | 0 | Jan. 16, 2022, 6:02 p.m. |
| RSA Factoring Challenge: RSA-704 | 0 | Jan. 15, 2022, 7:15 p.m. |
| M-138 — Part 1 | 100 | Jan. 6, 2022, 7:39 p.m. |
| Monoalphabetic Substitution with Nostradamus Flavor | 1,117 | Jan. 3, 2022, 12:24 p.m. |
| Double Columnar Transposition | 100 | Dec. 29, 2021, 6:49 p.m. |
| From Russia with Love | 100 | Dec. 25, 2021, 9:13 p.m. |
| The LoRa Cipher: Logic Randomness — Part 1 | 1,132 | Dec. 21, 2021, 9:10 p.m. |
| Beaver Code | 100 | Oct. 27, 2021, 7:04 p.m. |
| Handycipher made in love — Part 1 | 1,121 | Sept. 6, 2021, 2:59 a.m. |
| Number Sequence — Part 9 | 100 | Aug. 22, 2021, 6:58 p.m. |
| Number Sequence — Part 8 | 100 | Aug. 19, 2021, 6:31 a.m. |
| Number Sequence — Part 6 | 100 | Aug. 19, 2021, 6:28 a.m. |
| Number Sequence — Part 3 | 100 | Aug. 18, 2021, 4:50 p.m. |
| Number Sequence | 100 | Aug. 18, 2021, 4:48 p.m. |
| Monoalphabetic Substitution | 100 | Aug. 15, 2021, 7:32 a.m. |
| The Last Note | 100 | Aug. 12, 2021, 6:35 p.m. |
| Advent-Challenge — Part 1 | 100 | Aug. 11, 2021, 3:19 p.m. |
| Grille Cipher | 100 | Aug. 11, 2021, 3:07 p.m. |
| Letter to the Templars — Part 3 | 1,086 | Aug. 11, 2021, 12:22 p.m. |
| Letter to the Templars — Part 2 | 100 | Aug. 11, 2021, 10:30 a.m. |
| Letter to the Templars — Part 1 | 100 | Aug. 11, 2021, 7:12 a.m. |
| Cryptanalysis Hacking Puzzles — Part 2 | 100 | July 31, 2021, 2:41 p.m. |
| Factorization Cipher — Part 1 | 100 | July 28, 2021, 8:02 a.m. |
| Molehunt (Part 2/3) | 100 | July 28, 2021, 7:10 a.m. |
| Molehunt (Part 1/3) | 100 | July 19, 2021, 7:35 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | July 6, 2021, 6:23 p.m. |
| Number Sequence — Part 2 | 100 | July 5, 2021, 12:40 p.m. |
| A hidden word | 100 | July 2, 2021, noon |
| Cracking SHA1-Hashed Passwords | 1,082 | July 1, 2021, 6:25 p.m. |
| Original Caesar Cipher | 100 | July 1, 2021, 6:30 a.m. |