| An Invisible Message | 100 | Sept. 10, 2014, 1:27 p.m. |
| Cascading Encryption — Part 1/3 | 100 | Aug. 30, 2014, 6:31 p.m. |
| Recycled One-Time Pad | 100 | Aug. 30, 2014, 6:28 p.m. |
| Number Sequence — Part 5 | 100 | Aug. 29, 2014, 10:57 a.m. |
| Unusual encryption using a diophantine equation | 1,115 | Aug. 29, 2014, 10:46 a.m. |
| Molehunt (Part 3/3) | 1,108 | Aug. 26, 2014, 2:41 p.m. |
| Enigma Part 2 | 1,107 | Aug. 23, 2014, 9:58 p.m. |
| Enigma Part 1 | 1,107 | Aug. 23, 2014, 9:52 p.m. |
| A really long number sequence | 1,116 | Aug. 22, 2014, 3:03 p.m. |
| Pigpen with a twist — Part 2 | 1,116 | Aug. 20, 2014, 11:36 a.m. |
| Hill Cipher with Sudoku Key | 100 | Aug. 20, 2014, 12:30 a.m. |
| Enigma Messages | 100 | Aug. 16, 2014, 7:28 a.m. |
| Enigma Messages with Repeated Letters — Part 4 | 101 | Aug. 15, 2014, 4:12 p.m. |
| Enigma Messages with Repeated Letters — Part 5 | 101 | Aug. 14, 2014, 11:53 a.m. |
| Enigma Messages with Repeated Letters — Part 3 | 101 | Aug. 14, 2014, 9:09 a.m. |
| Enigma Messages with Repeated Letters — Part 2 | 100 | Aug. 14, 2014, 8:44 a.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | Aug. 10, 2014, 9:43 a.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | Aug. 8, 2014, 1:25 p.m. |
| Ku Klux Klan | 1,000 | Aug. 6, 2014, 2:45 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Aug. 6, 2014, 8:58 a.m. |
| Factorization Cipher — Part 3 | 1,120 | Aug. 6, 2014, 7:38 a.m. |
| Factorization Cipher — Part 2 | 1,119 | Aug. 4, 2014, 8:58 p.m. |
| Enigma Combinatorics | 100 | Aug. 3, 2014, 7:02 p.m. |
| Kaskade-S/T — Part 1 | 100 | Aug. 3, 2014, 6:33 p.m. |
| Double Column Transposition — Part 4 | 1,254 | July 31, 2014, 3:48 p.m. |
| RSA: Two different keys — same ciphertext | 1,116 | July 31, 2014, 1:55 a.m. |
| Hybrid Encryption I | 1,108 | July 31, 2014, 12:27 a.m. |
| ¿No Hablas Español? No problemo! | 100 | July 30, 2014, 11:32 p.m. |
| Playfair Encryption | 100 | July 29, 2014, 4:35 p.m. |
| Nils away on travel | 100 | July 27, 2014, 10:38 p.m. |
| Alice's Birthday Party (Part 1) | 1,108 | July 27, 2014, 9:25 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,108 | July 27, 2014, 9:13 p.m. |
| How do you become a big cryptographer? | 100 | July 27, 2014, 7:57 p.m. |
| Molehunt (Part 2/3) | 100 | July 26, 2014, 3:38 p.m. |
| Molehunt (Part 1/3) | 100 | July 26, 2014, 2:51 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,108 | July 25, 2014, 9:50 a.m. |
| Pigpen with a twist — Part 1 | 100 | July 23, 2014, 8:54 a.m. |
| From Russia with Love | 100 | July 21, 2014, 5:49 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,115 | July 21, 2014, 5:31 p.m. |
| Modified Caesar Cipher | 100 | July 21, 2014, 1:42 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | July 21, 2014, 12:31 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | July 21, 2014, 11:12 a.m. |
| Alice's Birthday Party (Part 2) | 1,108 | July 21, 2014, 9:01 a.m. |
| Snow White and the seven dwarfs | 100 | July 20, 2014, 11:53 a.m. |
| Cracking SHA1-Hashed Passwords | 1,112 | July 20, 2014, 10:16 a.m. |
| One-Time Pad with Flaws | 100 | July 19, 2014, 9:45 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | July 19, 2014, 9:03 p.m. |
| Grille Cipher | 100 | July 19, 2014, 8:31 p.m. |
| A hidden word | 100 | July 19, 2014, 8 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | July 19, 2014, 7:54 p.m. |
| Letter to the Templars — Part 3 | 1,133 | July 19, 2014, 7:39 p.m. |
| Factorization Cipher — Part 1 | 100 | July 19, 2014, 7:32 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | July 19, 2014, 6:33 p.m. |
| Number Sequence — Part 4 | 100 | July 19, 2014, 6:16 p.m. |
| Letter to the Templars — Part 2 | 100 | July 19, 2014, 6:10 p.m. |
| Monoalphabetic Substitution | 100 | July 19, 2014, 6:04 p.m. |
| Letter to the Templars — Part 1 | 100 | July 19, 2014, 4:45 p.m. |
| Number Sequence — Part 3 | 100 | July 19, 2014, 4:32 p.m. |
| Beaver Code | 100 | July 19, 2014, 4:13 p.m. |
| Caesar Encryption | 100 | July 19, 2014, 2:14 p.m. |
| Number Sequence — Part 2 | 100 | July 19, 2014, 10:38 a.m. |
| Number Sequence | 100 | July 19, 2014, 10:04 a.m. |
| Original Caesar Cipher | 100 | July 19, 2014, 9:48 a.m. |