| Lightweight Introduction to Lattices — Part 1 | 103 | June 20, 2020, 1:42 a.m. |
| New Year's Greetings — Part 3 | 100 | Sept. 2, 2019, 9:53 p.m. |
| ECDH-Key Exchange for Beginners | 100 | Sept. 1, 2019, 1:58 a.m. |
| New Year's Greetings — Part 2 | 100 | Aug. 25, 2019, 11:35 p.m. |
| New Year's Greetings — Part 1 | 100 | Aug. 25, 2019, 11:20 p.m. |
| News from Castle Mansfeld | 100 | Aug. 25, 2019, 10:14 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | Aug. 24, 2019, 7:38 p.m. |
| Hybrid Encryption I | 1,086 | Aug. 23, 2019, 10:06 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,086 | Aug. 23, 2019, 6:51 p.m. |
| RSA: Two different keys — same ciphertext | 1,088 | Aug. 18, 2019, 11:44 a.m. |
| Autokey Cipher | 100 | Aug. 17, 2019, 7:02 p.m. |
| BCR code (Book-Caesar-RSA) | 1,092 | Aug. 17, 2019, 1:25 p.m. |
| Cryptanalysis Hacking Puzzles — Part 2 | 100 | Aug. 11, 2019, 7:22 p.m. |
| Multilingual Monoalphabetic Substitution | 100 | July 26, 2019, 10:16 a.m. |
| Broadcasting and low exponent — RSA Attack | 1,088 | July 22, 2019, 8:42 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | July 21, 2019, 12:29 a.m. |
| Number Sequence — Part 7 | 100 | July 20, 2019, 9:19 p.m. |
| Number Sequence — Part 9 | 100 | July 20, 2019, 8:54 p.m. |
| Homophonic Encryption — Part 4 | 1,254 | July 20, 2019, 7:51 p.m. |
| Homophonic Encryption — Part 1 | 1,249 | July 20, 2019, 7:47 p.m. |
| Homophonic Encryption — Part 3 | 1,254 | July 20, 2019, 7:44 p.m. |
| Homophonic Encryption — Part 2 | 1,254 | July 20, 2019, 6:47 p.m. |
| Alice's Birthday Party (Part 2) | 1,086 | July 20, 2019, 6:16 p.m. |
| Playfair with hints about the grid | 100 | July 20, 2019, 1:19 p.m. |
| Playfair Encryption | 100 | July 20, 2019, 1:12 p.m. |
| Modular Sequences | 100 | July 16, 2019, 8:26 p.m. |
| Cascading Encryption — Part 1/3 | 100 | July 15, 2019, 8:12 p.m. |
| Double Columnar Transposition | 100 | July 15, 2019, 1:06 a.m. |
| Molehunt (Part 3/3) | 1,086 | July 14, 2019, 7:31 p.m. |
| Molehunt (Part 2/3) | 100 | July 13, 2019, 4:59 p.m. |
| Molehunt (Part 1/3) | 100 | July 12, 2019, 7:53 p.m. |
| ¿No Hablas Español? No problemo! | 100 | July 11, 2019, 10:49 p.m. |
| A really long number sequence | 1,088 | July 11, 2019, 8:14 p.m. |
| M-138 — Part 3 | 1,103 | July 10, 2019, 7:27 p.m. |
| Nils away on travel | 100 | July 7, 2019, 3:57 p.m. |
| A Secret Message from Castle Mansfeld | 100 | July 7, 2019, 1:20 p.m. |
| Alice's Birthday Party (Part 1) | 1,086 | July 5, 2019, 8:53 p.m. |
| Number Sequence — Part 6 | 100 | July 4, 2019, 8:20 p.m. |
| A hidden word — Part 2 | 100 | July 4, 2019, 7:59 p.m. |
| Number Sequence — Part 5 | 100 | July 4, 2019, 7:43 p.m. |
| M-138 — Part 2 | 1,103 | June 29, 2019, 8:32 p.m. |
| M-138 — Part 1 | 100 | June 27, 2019, 10:08 p.m. |
| Snow White and the seven dwarfs | 100 | June 27, 2019, 8:40 p.m. |
| Factorization Cipher — Part 3 | 1,090 | June 27, 2019, 7:27 p.m. |
| One-Time Pad with Flaws | 100 | June 24, 2019, 5:55 p.m. |
| Classical Ciphers^3 | 100 | June 24, 2019, 2:06 a.m. |
| Monoalphabetic Substitution | 100 | June 23, 2019, 8:50 p.m. |
| Cracking SHA1-Hashed Passwords | 1,087 | June 23, 2019, 7:19 p.m. |
| From Russia with Love | 100 | June 23, 2019, 6:20 p.m. |
| ADFGVX — Part 1 | 100 | June 23, 2019, 5:19 p.m. |
| RSA Factoring Challenge: RSA-220 | 0 | June 23, 2019, 4:51 p.m. |
| RSA Factoring Challenge: RSA-210 | 0 | June 23, 2019, 4:50 p.m. |
| RSA Factoring Challenge: RSA-704 | 0 | June 23, 2019, 4:48 p.m. |
| RSA Factoring Challenge: RSA-230 | 0 | June 23, 2019, 4:45 p.m. |
| How do you become a big cryptographer? | 100 | June 23, 2019, 4:17 p.m. |
| ADFGVX — Part 2 | 100 | June 23, 2019, 2:52 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | June 23, 2019, 1:53 a.m. |
| Pigpen with a twist — Part 1 | 100 | June 22, 2019, 6:09 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | June 22, 2019, 11:15 a.m. |
| Factorization Cipher — Part 2 | 1,089 | June 21, 2019, 9:19 p.m. |
| Modified Caesar Cipher | 100 | June 20, 2019, 11:32 p.m. |
| Number Sequence — Part 3 | 100 | June 20, 2019, 6:31 p.m. |
| Number Sequence | 100 | June 20, 2019, 12:48 a.m. |
| Grille Cipher | 100 | June 19, 2019, 1:11 a.m. |
| Factorization Cipher — Part 1 | 100 | June 19, 2019, 12:42 a.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | June 18, 2019, 10:45 p.m. |
| Caesar Encryption | 100 | June 18, 2019, 10 p.m. |
| Number Sequence — Part 2 | 100 | June 18, 2019, 9:31 p.m. |
| Original Caesar Cipher | 100 | June 18, 2019, 9:30 p.m. |
| Letter to the Templars — Part 3 | 1,092 | June 18, 2019, 8:41 p.m. |
| Number Sequence — Part 4 | 100 | June 10, 2019, 1:21 a.m. |
| Letter to the Templars — Part 2 | 100 | June 9, 2019, 11:54 p.m. |
| Beaver Code | 100 | June 9, 2019, 11:30 p.m. |
| A hidden word | 100 | June 9, 2019, 7:19 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | June 9, 2019, 5:15 p.m. |
| Trifid Cipher | 100 | June 9, 2019, 1:09 p.m. |
| Number Sequence — Part 8 | 100 | June 2, 2019, 11:40 p.m. |
| Advent-Challenge — Part 1 | 100 | June 2, 2019, 10:47 p.m. |
| Number Sequence — Part 10 | 100 | June 2, 2019, 9:07 p.m. |
| Letter to the Templars — Part 1 | 100 | May 4, 2019, 1:04 p.m. |