| Keyshanc — Part 2 | 1,109 | Jan. 12, 2016, 4:58 p.m. |
| Keyshanc — Part 1 | 1,109 | Jan. 9, 2016, 1:19 a.m. |
| M-138 — Part 3 | 1,159 | Dec. 7, 2015, 6 p.m. |
| ORYX Stream Cipher — Part 4a | 1,142 | Sept. 21, 2015, 8:33 p.m. |
| Heartbleed — Part 2 | 100 | July 12, 2015, 7:54 p.m. |
| Number Sequence — Part 2 | 100 | June 15, 2015, 9:07 p.m. |
| Number Sequence | 100 | June 15, 2015, 9:01 p.m. |
| Enigma Messages with Repeated Letters — Part 3 | 100 | June 10, 2015, 12:43 a.m. |
| M-138 — Part 2 | 1,198 | June 7, 2015, 10:20 p.m. |
| M-138 — Part 1 | 101 | May 19, 2015, 10:36 p.m. |
| Heartbleed — Part 1 | 101 | Nov. 10, 2014, 11:56 p.m. |
| Kaskade-S/T — Part 3 | 1,114 | April 23, 2014, 1:05 a.m. |
| Not-so-Secret Message from Malawi — Part II (ECC) | 1,112 | Feb. 18, 2014, 10:55 p.m. |
| Molehunt (Part 2/3) | 100 | Jan. 31, 2014, 9:10 p.m. |
| Molehunt (Part 1/3) | 100 | Jan. 31, 2014, 12:42 a.m. |
| Nils away on travel | 101 | Jan. 29, 2014, 1:02 p.m. |
| Kaskade-S/T — Part 2 | 1,116 | Jan. 26, 2014, 1:29 a.m. |
| ECDH-Key Exchange for Beginners | 100 | Jan. 24, 2014, 5:53 p.m. |
| Kaskade-S/T — Part 1 | 100 | Jan. 23, 2014, 11:32 p.m. |
| AES key — encoded in the machine readable zone of a European ePassport | 1,129 | Jan. 21, 2014, 6:23 p.m. |
| A hidden word | 100 | Jan. 18, 2014, 4:59 p.m. |
| One-Time Pad with Flaws | 100 | Jan. 18, 2014, 1:46 a.m. |
| ORYX Stream Cipher — Part 3 (revised) | 1,196 | Nov. 25, 2013, 9:40 p.m. |
| ORYX Stream Cipher Part II | 1,114 | Nov. 15, 2013, 12:49 a.m. |
| ORYX Stream Cipher Part I | 1,114 | Nov. 9, 2013, 2:32 a.m. |
| Enigma Part 2 | 1,115 | Nov. 2, 2013, 1:14 a.m. |
| Enigma Messages with Repeated Letters — Part 2 | 125 | Nov. 1, 2013, 5 p.m. |
| Trifid Cipher | 133 | Oct. 31, 2013, 12:45 a.m. |
| Smartcard RSA | 1,116 | Oct. 14, 2013, 12:25 a.m. |
| Hybrid Encryption I | 1,116 | Oct. 12, 2013, 8:46 p.m. |
| Enigma Combinatorics | 100 | Oct. 8, 2013, 1:10 p.m. |
| Enigma Part 1 | 1,115 | Oct. 5, 2013, 2:05 a.m. |
| Typex — Part 2 | 1,192 | Oct. 4, 2013, 12:42 a.m. |
| Typex — Part 1 | 1,184 | Sept. 28, 2013, 10:28 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 200 | Sept. 26, 2013, 11:59 p.m. |
| Hill Cipher with Sudoku Key | 117 | Sept. 10, 2013, 1:32 a.m. |
| From Russia with Love | 117 | Sept. 9, 2013, 4:40 p.m. |
| Partial Key Exposure with RSA — Part 1 | 1,138 | Sept. 9, 2013, 2:08 a.m. |
| Unconcealed RSA messages | 1,132 | Sept. 9, 2013, 1:13 a.m. |
| BCR code (Book-Caesar-RSA) | 1,159 | Sept. 2, 2013, 12:38 a.m. |
| RSA: Two different keys — same ciphertext | 1,128 | Aug. 29, 2013, 12:08 a.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,117 | Aug. 28, 2013, 12:33 a.m. |
| Broadcasting and low exponent — RSA Attack | 1,127 | Aug. 27, 2013, 4:50 p.m. |
| Alice's Birthday Party (Part 2) | 1,117 | Aug. 27, 2013, 4:06 p.m. |
| Alice's Birthday Party (Part 1) | 1,117 | Aug. 27, 2013, 1:16 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,117 | Aug. 26, 2013, 7:21 p.m. |
| Factorization Cipher — Part 3 | 1,137 | Aug. 25, 2013, 3:17 p.m. |
| Reserve Hand Procedure — Part 1 | 101 | Aug. 25, 2013, 3:11 p.m. |
| Factorization Cipher — Part 2 | 1,135 | Aug. 9, 2013, 1:45 a.m. |
| Factorization Cipher — Part 1 | 100 | Aug. 3, 2013, 5:23 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Aug. 1, 2013, 11:45 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Aug. 1, 2013, 2:19 a.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Aug. 1, 2013, 1:28 a.m. |
| Grille Cipher | 100 | July 29, 2013, 9:44 p.m. |
| How do you become a big cryptographer? | 100 | July 29, 2013, 9:11 p.m. |
| Beaver Code | 100 | July 29, 2013, 9:07 p.m. |
| Modified Caesar Cipher | 100 | July 28, 2013, 4:17 p.m. |
| Cracking SHA1-Hashed Passwords | 1,124 | July 26, 2013, 10:51 p.m. |
| Letter to the Templars — Part 3 | 1,168 | July 24, 2013, 11:28 p.m. |
| Letter to the Templars — Part 2 | 100 | July 24, 2013, 11:26 p.m. |
| Letter to the Templars — Part 1 | 100 | July 24, 2013, 11:24 p.m. |
| Snow White and the seven dwarfs | 101 | July 24, 2013, 11:13 p.m. |
| Monoalphabetic Substitution | 100 | July 24, 2013, 11:07 p.m. |
| Caesar Encryption | 100 | July 24, 2013, 11:03 p.m. |
| Original Caesar Cipher | 100 | July 24, 2013, 10:44 p.m. |