| Trifid Cipher | 150 | Oct. 30, 2013, 6:04 p.m. |
| Enigma Messages with Repeated Letters — Part 2 | 150 | Oct. 30, 2013, 5:04 p.m. |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 1,118 | Oct. 28, 2013, 9:09 p.m. |
| Factorization Cipher — Part 3 | 1,133 | Oct. 27, 2013, 10:50 p.m. |
| ADFGVX — Part 2 | 100 | Oct. 26, 2013, 9:07 p.m. |
| ADFGVX — Part 1 | 100 | Oct. 25, 2013, 10:12 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | Oct. 22, 2013, 2:08 p.m. |
| Molehunt (Part 2/3) | 100 | Oct. 21, 2013, 7:20 p.m. |
| Molehunt (Part 1/3) | 100 | Oct. 20, 2013, 8:42 p.m. |
| Hybrid Encryption I | 1,116 | Oct. 6, 2013, 1:52 a.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,115 | Oct. 5, 2013, 3:44 a.m. |
| BCR code (Book-Caesar-RSA) | 1,155 | Oct. 2, 2013, 3:12 a.m. |
| ECDH-Key Exchange for Beginners | 100 | Oct. 1, 2013, 11:25 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,116 | Sept. 29, 2013, 8:17 p.m. |
| Alice's Birthday Party (Part 1) | 1,116 | Sept. 29, 2013, 5:44 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,126 | Sept. 29, 2013, 4:05 p.m. |
| Alice's Birthday Party (Part 2) | 1,116 | Sept. 28, 2013, 7:48 p.m. |
| Classical Ciphers^3 | 100 | Sept. 28, 2013, 2:47 a.m. |
| Pigpen with a twist — Part 1 | 100 | Sept. 27, 2013, 7:01 p.m. |
| Factorization Cipher — Part 2 | 1,133 | Sept. 26, 2013, 9:41 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 200 | Sept. 26, 2013, 4:49 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | Sept. 25, 2013, 2:56 a.m. |
| Monoalphabetic Substitution | 100 | Sept. 14, 2013, 1:42 a.m. |
| Letter to the Templars — Part 3 | 1,161 | Sept. 13, 2013, 11:36 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Sept. 13, 2013, 9:19 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Sept. 13, 2013, 7:41 p.m. |
| One-Time Pad with Flaws | 100 | Sept. 13, 2013, 7:10 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Sept. 13, 2013, 6:13 p.m. |
| Factorization Cipher — Part 1 | 100 | Sept. 13, 2013, 2:12 a.m. |
| From Russia with Love | 111 | Sept. 13, 2013, 12:42 a.m. |
| Enigma Combinatorics | 100 | Sept. 12, 2013, 11:28 p.m. |
| Snow White and the seven dwarfs | 101 | Sept. 10, 2013, 1:21 a.m. |
| Caesar Encryption | 100 | Sept. 8, 2013, 8:06 p.m. |
| Number Sequence — Part 4 | 100 | Sept. 8, 2013, 6:54 p.m. |
| Number Sequence — Part 2 | 100 | Sept. 8, 2013, 6:33 p.m. |
| Number Sequence | 100 | Sept. 8, 2013, 6:25 p.m. |
| Grille Cipher | 100 | Sept. 8, 2013, 6:03 p.m. |
| Letter to the Templars — Part 2 | 100 | Sept. 8, 2013, 5:37 p.m. |
| Letter to the Templars — Part 1 | 100 | Sept. 8, 2013, 5:15 p.m. |
| Hill Cipher with Sudoku Key | 133 | Sept. 7, 2013, 3:30 a.m. |
| A hidden word | 100 | Sept. 7, 2013, 1:42 a.m. |
| Beaver Code | 100 | Sept. 7, 2013, 1:27 a.m. |
| Original Caesar Cipher | 100 | Sept. 6, 2013, 10:01 p.m. |
| Reserve Hand Procedure — Part 1 | 101 | Sept. 6, 2013, 5:01 p.m. |
| Modified Caesar Cipher | 100 | Sept. 6, 2013, 3:44 a.m. |
Gold0
Silver0
Bronze0
