| Zodiac Cipher | 100 | Feb. 8, 2015, 10:54 p.m. |
| Cascading Encryption — Part 1/3 | 100 | Dec. 18, 2014, 11:46 p.m. |
| Monoalphabetic substitution with camouflage — Part 1 | 100 | Dec. 17, 2014, 11:10 p.m. |
| An 'unhearable' message | 100 | Dec. 16, 2014, 10:29 p.m. |
| Pigpen with a twist — Part 2 | 1,112 | Dec. 16, 2014, 2:03 p.m. |
| Double Columnar Transposition | 100 | Dec. 12, 2014, 8:48 p.m. |
| Playfair with hints about the grid | 100 | Dec. 7, 2014, 10:53 p.m. |
| Playfair Encryption | 100 | Dec. 7, 2014, 10:44 p.m. |
| ADFGVX — Part 1 | 100 | Dec. 7, 2014, 10:57 a.m. |
| ADFGVX — Part 2 | 100 | Dec. 6, 2014, 10:05 p.m. |
| Trifid Cipher | 100 | Dec. 6, 2014, 9:33 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | Dec. 6, 2014, 2:20 p.m. |
| Enigma Part 1 | 1,105 | Dec. 5, 2014, 11:28 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Dec. 5, 2014, 2:26 p.m. |
| A really long number sequence | 1,113 | Dec. 4, 2014, 7:53 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | June 14, 2014, 8:36 p.m. |
| BCR code (Book-Caesar-RSA) | 1,142 | Feb. 20, 2014, 12:53 p.m. |
| Kaskade-S/T — Part 1 | 100 | Feb. 18, 2014, 3:05 p.m. |
| Enigma Combinatorics | 100 | Feb. 17, 2014, 8:48 p.m. |
| Unconcealed RSA messages | 1,124 | Feb. 13, 2014, 11:53 a.m. |
| Molehunt (Part 2/3) | 100 | Feb. 11, 2014, 2:51 p.m. |
| Molehunt (Part 1/3) | 100 | Feb. 11, 2014, 2:17 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,112 | Feb. 10, 2014, 11:08 a.m. |
| Reserve Hand Procedure — Part 1 | 100 | Jan. 28, 2014, 6:55 p.m. |
| Pigpen with a twist — Part 1 | 100 | Jan. 25, 2014, 10:20 a.m. |
| ¿No Hablas Español? No problemo! | 100 | Jan. 23, 2014, 8:20 p.m. |
| A Secret Message from Castle Mansfeld | 100 | Jan. 23, 2014, 6:43 p.m. |
| Factorization Cipher — Part 3 | 1,128 | Jan. 17, 2014, 4:14 p.m. |
| Factorization Cipher — Part 2 | 1,127 | Jan. 16, 2014, 8:32 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,113 | Jan. 16, 2014, 4:18 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | Jan. 16, 2014, 12:49 p.m. |
| Alice's Birthday Party (Part 1) | 1,113 | Jan. 15, 2014, 8:37 p.m. |
| Nils away on travel | 101 | Jan. 15, 2014, 6:38 p.m. |
| An Invisible Message | 100 | Jan. 15, 2014, 6:07 p.m. |
| From Russia with Love | 101 | Jan. 13, 2014, 6:47 p.m. |
| RSA: Two different keys — same ciphertext | 1,122 | Jan. 13, 2014, 1:07 p.m. |
| Hybrid Encryption I | 1,113 | Jan. 13, 2014, 12:37 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,122 | Jan. 12, 2014, 8:34 p.m. |
| Alice's Birthday Party (Part 2) | 1,113 | Jan. 12, 2014, 7:31 p.m. |
| One-Time Pad with Flaws | 100 | Jan. 12, 2014, 10:24 a.m. |
| Modified Caesar Cipher | 100 | Jan. 12, 2014, 12:04 a.m. |
| Classical Ciphers^3 | 100 | Jan. 7, 2014, 9:48 p.m. |
| Hill Cipher with Sudoku Key | 101 | Jan. 7, 2014, 4:21 p.m. |
| ECDH-Key Exchange for Beginners | 100 | Jan. 6, 2014, 3:01 p.m. |
| How do you become a big cryptographer? | 100 | Jan. 6, 2014, 1:58 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Jan. 5, 2014, 8:06 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Jan. 5, 2014, 1:22 p.m. |
| Snow White and the seven dwarfs | 100 | Jan. 5, 2014, 11:41 a.m. |
| Cracking SHA1-Hashed Passwords | 1,118 | Jan. 3, 2014, 5:13 p.m. |
| Letter to the Templars — Part 3 | 1,148 | Jan. 3, 2014, 4:42 p.m. |
| Grille Cipher | 100 | Jan. 2, 2014, 8:10 p.m. |
| A hidden word | 100 | Jan. 2, 2014, 7:18 p.m. |
| Factorization Cipher — Part 1 | 100 | Jan. 2, 2014, 6:58 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Jan. 2, 2014, 11:23 a.m. |
| Letter to the Templars — Part 2 | 100 | Jan. 1, 2014, 11:35 p.m. |
| Number Sequence — Part 4 | 100 | Jan. 1, 2014, 11:26 p.m. |
| Letter to the Templars — Part 1 | 100 | Jan. 1, 2014, 11:19 p.m. |
| Number Sequence — Part 3 | 100 | Jan. 1, 2014, 9:25 p.m. |
| Beaver Code | 100 | Jan. 1, 2014, 8:49 p.m. |
| Monoalphabetic Substitution | 100 | Jan. 1, 2014, 8:14 p.m. |
| Caesar Encryption | 100 | Jan. 1, 2014, 6:18 p.m. |
| Number Sequence — Part 2 | 100 | Jan. 1, 2014, 6:07 p.m. |
| Original Caesar Cipher | 100 | Jan. 1, 2014, 5:37 p.m. |
| Number Sequence | 100 | Jan. 1, 2014, 5:33 p.m. |