| Spanish Strip Cipher — Part 1 | 1,243 | June 20, 2014, 8:03 a.m. |
| Recycled One-Time Pad | 100 | June 17, 2014, 9:34 a.m. |
| Enigma Messages | 100 | June 15, 2014, 9:32 a.m. |
| Enigma Messages with Repeated Letters — Part 5 | 101 | June 14, 2014, 5:41 p.m. |
| Enigma Messages with Repeated Letters — Part 4 | 101 | June 14, 2014, 5:07 p.m. |
| Enigma Messages with Repeated Letters — Part 3 | 101 | June 14, 2014, 4:42 p.m. |
| Enigma Messages with Repeated Letters — Part 2 | 100 | June 14, 2014, 4:30 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | June 12, 2014, 11:27 a.m. |
| Double Column Transposition — Part 3 | 1,344 | May 29, 2014, 3:46 p.m. |
| Double Column Transposition — Part 2 | 1,344 | May 29, 2014, 11:45 a.m. |
| Double Column Transposition — Part 4 | 1,502 | May 28, 2014, 1:06 p.m. |
| Nils away on travel | 100 | May 27, 2014, 4:27 p.m. |
| From Russia with Love | 100 | May 26, 2014, 10:18 a.m. |
| Hill Cipher with Sudoku Key | 100 | May 25, 2014, 11:48 a.m. |
| Trifid Cipher | 100 | May 24, 2014, 8:46 a.m. |
| Multilingual Monoalphabetic Substitution | 101 | July 30, 2013, 9:35 a.m. |
| Reserve Hand Procedure — Part 1 | 101 | July 25, 2013, 12:04 p.m. |
| Snow White and the seven dwarfs | 103 | May 27, 2013, 9:40 a.m. |
| Cascading Encryption — Part 1/3 | 150 | Jan. 26, 2013, 8:46 p.m. |
| Playfair with hints about the grid | 133 | Jan. 18, 2013, 8:33 p.m. |
| A hidden word | 120 | Jan. 10, 2013, 8:53 p.m. |
| Letter to the Templars — Part 3 | 1,824 | Oct. 11, 2012, 8:43 a.m. |
| BCR code (Book-Caesar-RSA) | 1,613 | Sept. 17, 2012, 9:10 a.m. |
| Beaver Code | 113 | Aug. 21, 2012, 3:43 p.m. |
| Letter to the Templars — Part 2 | 111 | Aug. 8, 2012, 6:15 p.m. |
| Letter to the Templars — Part 1 | 104 | Aug. 8, 2012, 6:14 p.m. |
| One-Time Pad with Flaws | 100 | June 16, 2012, 11:28 p.m. |
| Monoalphabetic substitution with camouflage — Part 4 | 101 | June 16, 2012, 7:15 p.m. |
| ADFGVX — Part 1 | 100 | June 15, 2012, 9:54 p.m. |
| ADFGVX — Part 2 | 100 | June 15, 2012, 9:15 p.m. |
| Playfair Encryption | 100 | June 14, 2012, 4:48 p.m. |
| How do you become a big cryptographer? | 106 | June 13, 2012, 5:12 p.m. |
| Double Columnar Transposition | 100 | June 12, 2012, 9:46 a.m. |
| Grille Cipher | 100 | June 11, 2012, 6:02 p.m. |
| Kaskade-S/T — Part 2 | 1,147 | June 7, 2012, 9:15 p.m. |
| Kaskade-S/T — Part 1 | 100 | June 7, 2012, 5:18 p.m. |
| Molehunt (Part 3/3) | 1,137 | June 7, 2012, 11:22 a.m. |
| Molehunt (Part 2/3) | 100 | June 6, 2012, 3:32 p.m. |
| Molehunt (Part 1/3) | 100 | June 6, 2012, 11:51 a.m. |
| Monoalphabetic Substitution | 100 | June 4, 2012, 5:08 p.m. |
| ¿No Hablas Español? No problemo! | 102 | June 4, 2012, 1:38 p.m. |
| Monoalphabetic substitution with camouflage — Part 3 | 1,195 | May 30, 2012, 10:57 p.m. |
| Monoalphabetic substitution with camouflage — Part 2 | 1,196 | May 27, 2012, 6:34 p.m. |
| Monoalphabetic substitution with camouflage — Part 1 | 100 | May 26, 2012, 11:20 a.m. |
| Keyshanc — Part 2 | 1,725 | May 24, 2012, 4:19 p.m. |
| Keyshanc — Part 1 | 1,725 | May 23, 2012, 9:26 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | May 20, 2012, 8:59 p.m. |
| Not-so-Secret Message from Malawi — Part II (ECC) | 1,138 | May 18, 2012, 9:29 a.m. |
| Number Sequence — Part 4 | 104 | May 14, 2012, 6:57 p.m. |
| Pigpen with a twist — Part 1 | 100 | May 14, 2012, 6:52 p.m. |
| Lattice Part 1 | 1,150 | May 13, 2012, 3:49 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | May 6, 2012, 5:30 p.m. |
| Number Sequence — Part 3 | 103 | May 6, 2012, 5 p.m. |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 1,146 | May 6, 2012, 4:41 p.m. |
| A really long number sequence | 1,177 | May 4, 2012, 11:57 p.m. |
| Enigma Part 2 | 1,139 | April 29, 2012, 3 p.m. |
| Modified Caesar Cipher | 100 | April 28, 2012, 5:31 p.m. |
| Caesar Encryption | 100 | April 28, 2012, 3:59 p.m. |
| Enigma Part 1 | 1,139 | April 26, 2012, 3:34 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,140 | April 14, 2012, 8:49 a.m. |
| AES key — encoded in the machine readable zone of a European ePassport | 1,240 | April 12, 2012, 8:46 p.m. |
| CMEA 1 | 1,144 | April 10, 2012, 5:39 p.m. |
| ORYX Stream Cipher Part I | 1,141 | April 1, 2012, 8:59 p.m. |
| Unconcealed RSA messages | 1,216 | March 6, 2012, 6:56 a.m. |
| Factorization Cipher — Part 3 | 1,272 | March 4, 2012, 5:26 p.m. |
| Factorization Cipher — Part 2 | 1,236 | March 3, 2012, 7:36 p.m. |
| ECDH-Key Exchange for Beginners | 120 | Feb. 28, 2012, 10:05 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 101 | Feb. 27, 2012, 7:05 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Feb. 26, 2012, 6:41 p.m. |
| Number Sequence — Part 2 | 100 | Feb. 26, 2012, 5:59 p.m. |
| Original Caesar Cipher | 100 | Feb. 26, 2012, 5:55 p.m. |
| Number Sequence | 100 | Feb. 26, 2012, 5:44 p.m. |
| Cracking SHA1-Hashed Passwords | 1,164 | Feb. 14, 2012, 11:22 p.m. |
| Hybrid Encryption I | 1,146 | Feb. 13, 2012, 10:09 p.m. |
| RSA: Two different keys — same ciphertext | 1,193 | Feb. 12, 2012, 11:15 p.m. |
| Smartcard RSA | 1,146 | Feb. 12, 2012, 9:56 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,145 | Feb. 12, 2012, 4:31 p.m. |
| Alice's Birthday Party (Part 2) | 1,145 | Feb. 12, 2012, 11:52 a.m. |
| Alice's Birthday Party (Part 1) | 1,145 | Feb. 12, 2012, 11:38 a.m. |
| Unusual encryption using a diophantine equation | 1,199 | Feb. 12, 2012, 9:08 a.m. |
| Factorization Cipher — Part 1 | 101 | Feb. 11, 2012, 11:03 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,186 | Feb. 11, 2012, 7:12 p.m. |
| Partial Key Exposure with RSA — Part 1 | 2,000 | Feb. 11, 2012, 5:53 p.m. |
Gold0
Silver0
Bronze0
