| Number Sequence — Part 7 | 100 | Jan. 6, 2019, 7:14 p.m. |
| Advent-Challenge — Part 1 | 100 | Jan. 6, 2019, 6:36 p.m. |
| Advent Challenge — Part 3 | 1,156 | Jan. 1, 2019, 11:38 p.m. |
| Advent Challenge — Part 4 | 1,156 | Jan. 1, 2019, 11:18 p.m. |
| Number Sequence — Part 10 | 100 | Jan. 1, 2019, 9:06 p.m. |
| Breaking a Filter Generator | 1,232 | Dec. 31, 2018, 7:29 p.m. |
| Summer Job | 1,187 | Dec. 31, 2018, 5:36 p.m. |
| Trendy Messenger | 1,187 | Dec. 31, 2018, 5:02 p.m. |
| Fastest in the West | 1,187 | Dec. 31, 2018, 4:12 p.m. |
| Lattice Part 1 | 1,092 | Jan. 11, 2018, 8 p.m. |
| AES ECB Wrong Encoding | 1,613 | Dec. 21, 2017, 4:40 p.m. |
| Advent-Challenge — Part 2 | 1,613 | Dec. 21, 2017, 2:27 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 | 1,093 | Nov. 28, 2017, 5:38 p.m. |
| RSA with Special d | 13,232 | Nov. 8, 2017, 7:49 p.m. |
| ORYX Stream Cipher — Part 3 (revised) | 1,106 | June 27, 2017, 12:49 p.m. |
| Enigma Part 1 | 1,092 | June 27, 2017, 9:28 a.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,092 | June 25, 2017, 9:32 p.m. |
| ORYX Stream Cipher Part II | 1,092 | June 22, 2017, 1:42 p.m. |
| Heartbleed — Part 3 | 1,117 | June 21, 2017, 1:11 p.m. |
| Heartbleed — Part 2 | 100 | June 21, 2017, 12:55 p.m. |
| Heartbleed — Part 1 | 100 | June 21, 2017, 12:23 p.m. |
| ORYX Stream Cipher Part I | 1,092 | June 19, 2017, 11:40 a.m. |
| RSA Factoring Challenge: RSA-210 | 0 | June 16, 2017, 9:03 p.m. |
| RSA Factoring Challenge: RSA-220 | 0 | June 16, 2017, 8:59 p.m. |
| RSA Factoring Challenge: RSA-704 | 0 | June 16, 2017, 8:56 p.m. |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 1,093 | June 16, 2017, 8:35 p.m. |
| Not-so-Secret Message from Malawi — Part II (ECC) | 1,092 | June 15, 2017, 11:59 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | June 7, 2017, 9:01 p.m. |
| Unconcealed RSA messages | 1,097 | June 6, 2017, 7:26 p.m. |
| A hidden word — Part 2 | 100 | June 6, 2017, 4:08 p.m. |
| ECDH-Key Exchange for Beginners | 100 | June 6, 2017, 2:44 p.m. |
| Unusual encryption using a diophantine equation | 1,096 | June 5, 2017, 6:11 p.m. |
| BCR code (Book-Caesar-RSA) | 1,102 | June 4, 2017, 8:07 p.m. |
| RSA: Two different keys — same ciphertext | 1,096 | June 4, 2017, 2:33 p.m. |
| Factorization Cipher — Part 3 | 1,098 | June 4, 2017, 2:12 a.m. |
| Factorization Cipher — Part 2 | 1,097 | June 2, 2017, 10:23 p.m. |
| Factorization Cipher — Part 1 | 100 | June 1, 2017, 10:28 p.m. |
| Partial Key Exposure with RSA — Part 1 | 1,098 | June 1, 2017, 3:14 p.m. |
| Smartcard RSA | 1,093 | June 1, 2017, 10:48 a.m. |
| Hybrid Encryption I | 1,093 | May 30, 2017, 2:25 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,093 | May 30, 2017, 1:46 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,096 | May 30, 2017, 12:38 p.m. |
| Alice's Birthday Party (Part 2) | 1,093 | May 30, 2017, 11:57 a.m. |
| Alice's Birthday Party (Part 1) | 1,093 | May 30, 2017, 11:42 a.m. |
| Letter to the Templars — Part 3 | 1,102 | May 29, 2017, 7:05 p.m. |
| Grille Cipher | 100 | May 29, 2017, 5:16 p.m. |
| How do you become a big cryptographer? | 100 | May 29, 2017, 3:03 p.m. |
| Cracking SHA1-Hashed Passwords | 1,095 | May 26, 2017, 11:44 p.m. |
| Number Sequence — Part 6 | 100 | May 26, 2017, 10:57 p.m. |
| Number Sequence — Part 8 | 100 | May 26, 2017, 10:50 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | May 26, 2017, 10:41 p.m. |
| A hidden word | 100 | May 26, 2017, 7:46 p.m. |
| Letter to the Templars — Part 2 | 100 | May 26, 2017, 7:34 p.m. |
| Letter to the Templars — Part 1 | 100 | May 26, 2017, 5:09 p.m. |
| Beaver Code | 100 | May 26, 2017, 3:43 p.m. |
| Caesar Encryption | 100 | May 26, 2017, 12:09 p.m. |
| Original Caesar Cipher | 100 | May 26, 2017, 11:26 a.m. |
| Number Sequence — Part 4 | 100 | May 26, 2017, 10:38 a.m. |
| Number Sequence — Part 3 | 100 | May 26, 2017, 10:31 a.m. |
| Number Sequence — Part 2 | 100 | May 25, 2017, 8:10 p.m. |
| Number Sequence | 100 | May 25, 2017, 3:58 p.m. |