| Pigpen with a twist — Part 1 | 101 | Dec. 15, 2011, 3:20 p.m. |
| Alice's Birthday Party (Part 2) | 1,150 | Dec. 14, 2011, 4:12 p.m. |
| Unusual encryption using a diophantine equation | 1,229 | Dec. 14, 2011, 11:29 a.m. |
| A really long number sequence | 1,231 | Dec. 14, 2011, 9:10 a.m. |
| Double Columnar Transposition | 102 | Dec. 11, 2011, 8:01 p.m. |
| Alice's Birthday Party (Part 1) | 1,151 | Dec. 11, 2011, 6:20 p.m. |
| Monoalphabetic Substitution | 100 | Dec. 11, 2011, 2:01 a.m. |
| Caesar Encryption | 100 | Dec. 11, 2011, 12:43 a.m. |
| Original Caesar Cipher | 100 | Dec. 11, 2011, 12:03 a.m. |
| Grille Cipher | 102 | Dec. 10, 2011, 10:23 p.m. |
| Factorization Cipher — Part 1 | 102 | Dec. 10, 2011, 9:38 p.m. |