| Enigma Part 1 | 1,140 | April 13, 2012, 6:53 p.m. |
| Hybrid Encryption I | 1,141 | April 13, 2012, 4:23 a.m. |
| CMEA 1 | 1,144 | April 13, 2012, 12:57 a.m. |
| Partial Key Exposure with RSA — Part 1 | 1,362 | March 6, 2012, 1:42 a.m. |
| Factorization Cipher — Part 3 | 1,725 | Jan. 8, 2012, 6:49 p.m. |
| Alice's Birthday Party (Part 2) | 1,151 | Dec. 7, 2011, 12:16 a.m. |
| Alice's Birthday Party (Part 1) | 1,151 | Dec. 7, 2011, 12:07 a.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,152 | Dec. 4, 2011, 7:29 a.m. |
| Cracking SHA1-Hashed Passwords | 1,177 | Dec. 3, 2011, 6:30 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,211 | Dec. 3, 2011, 6:30 a.m. |
| Unusual encryption using a diophantine equation | 1,237 | Dec. 3, 2011, 6:15 a.m. |
| A really long number sequence | 1,240 | Dec. 2, 2011, 8:59 a.m. |
| Factorization Cipher — Part 2 | 2,000 | Dec. 2, 2011, 1:04 a.m. |
| Factorization Cipher — Part 1 | 102 | Nov. 30, 2011, 10:47 p.m. |
| Pigpen with a twist — Part 1 | 101 | Nov. 30, 2011, 1:42 a.m. |
| RSA: Two different keys — same ciphertext | 1,249 | Nov. 1, 2011, 5:59 a.m. |