| Homophonic Encryption — Part 2 | 1,107 | March 28, 2023, 10:03 p.m. |
| Polyhomophonic Substitution — Part 2 | 1,115 | March 23, 2023, 8:48 p.m. |
| Homophonic Encryption — Part 1 | 1,108 | Feb. 21, 2023, 7 p.m. |
| Polyhomophonic Substitution — Part 1 | 100 | Feb. 16, 2023, 8:36 p.m. |
| Monoalphabetic Substitution with Nostradamus Flavor | 1,107 | Feb. 7, 2023, 8:32 p.m. |
| The Syllabary Cipher – Part 1 | 101 | Feb. 6, 2023, 11:52 a.m. |
| New Year's Greetings — Part 5 | 1,092 | Feb. 1, 2023, 7:02 p.m. |
| New Year's Greetings — Part 4 | 100 | Feb. 1, 2023, 7 p.m. |
| New Year's Greetings — Part 3 | 100 | Feb. 1, 2023, 6:59 p.m. |
| New Year's Greetings — Part 2 | 100 | Feb. 1, 2023, 6:45 p.m. |
| New Year's Greetings — Part 1 | 100 | Feb. 1, 2023, 6:44 p.m. |
| Classical Ciphers^3 | 100 | Jan. 19, 2023, 5:12 p.m. |
| Number Sequence — Part 8 | 100 | March 25, 2021, 3:41 p.m. |
| Number Sequence — Part 6 | 100 | March 25, 2021, 3:15 p.m. |
| Molehunt (Part 3/3) | 1,082 | March 25, 2021, 1:59 p.m. |
| Molehunt (Part 2/3) | 100 | Feb. 25, 2021, 9:12 p.m. |
| Molehunt (Part 1/3) | 100 | Feb. 25, 2021, 4:37 p.m. |
| Not-so-Secret Message from Malawi — Part II (ECC) | 1,082 | Feb. 25, 2021, 9:22 a.m. |
| Unconcealed RSA messages | 1,085 | Jan. 6, 2021, 3:41 p.m. |
| RSA: Two different keys — same ciphertext | 1,084 | Dec. 14, 2020, 1:55 p.m. |
| Factorization Cipher — Part 3 | 1,085 | Dec. 9, 2020, 1:53 p.m. |
| Factorization Cipher — Part 2 | 1,085 | Dec. 2, 2020, 1:52 p.m. |
| Advent Challenge — Part 4 | 1,116 | Dec. 2, 2020, 9:42 a.m. |
| Autokey Cipher | 100 | Nov. 30, 2020, 10:04 a.m. |
| Beaver Code | 100 | Nov. 27, 2020, 2:06 p.m. |
| Alice's Birthday Party (Part 2) | 1,083 | Nov. 26, 2020, 10:21 p.m. |
| Alice's Birthday Party (Part 1) | 1,083 | Nov. 26, 2020, 10:19 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,083 | Nov. 23, 2020, 12:02 p.m. |
| Number Sequence — Part 4 | 100 | Nov. 23, 2020, 11:35 a.m. |
| Number Sequence — Part 3 | 100 | Nov. 23, 2020, 11:34 a.m. |
| Broadcasting and low exponent — RSA Attack | 1,084 | Nov. 19, 2020, 10:18 a.m. |
| Factorization Cipher — Part 1 | 100 | Nov. 18, 2020, 9:12 a.m. |
| Caesar Encryption | 100 | Nov. 18, 2020, 9:08 a.m. |
| Letter to the Templars — Part 3 | 1,088 | Nov. 17, 2020, 3:13 p.m. |
| Letter to the Templars — Part 2 | 100 | Nov. 17, 2020, 3:10 p.m. |
| Letter to the Templars — Part 1 | 100 | Nov. 17, 2020, 3:07 p.m. |
| Summer Job | 1,122 | Nov. 17, 2020, 1:57 p.m. |
| Number Sequence — Part 2 | 100 | Nov. 12, 2020, 1:21 p.m. |
| Number Sequence | 100 | Nov. 12, 2020, 1:19 p.m. |
| Advent Challenge — Part 3 | 1,116 | Nov. 11, 2020, 3:22 p.m. |
| Advent-Challenge — Part 2 | 1,116 | Nov. 11, 2020, 9:31 a.m. |
| Monoalphabetic Substitution | 100 | Sept. 21, 2020, 11:42 a.m. |
| Advent-Challenge — Part 1 | 100 | Sept. 21, 2020, 10:20 a.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Sept. 9, 2020, 2:11 p.m. |
| Original Caesar Cipher | 100 | Sept. 9, 2020, 1:30 p.m. |
| Grille Cipher | 100 | Sept. 8, 2020, 3:12 p.m. |
| Nils away on travel | 100 | Sept. 8, 2020, 2:11 p.m. |
| From Russia with Love | 100 | Sept. 8, 2020, 1:14 p.m. |