| M-138 — Part 3 | 1,150 | Feb. 29, 2016, 1:41 a.m. |
| M-138 — Part 2 | 1,150 | Feb. 26, 2016, 7:07 p.m. |
| Playfair with hints about the grid | 103 | Feb. 17, 2013, 2:59 p.m. |
| Letter to the Templars — Part 3 | 1,725 | Oct. 11, 2012, 11:04 p.m. |
| Beaver Code | 150 | Aug. 15, 2012, 12:52 a.m. |
| Letter to the Templars — Part 2 | 133 | Aug. 1, 2012, 10:05 p.m. |
| Letter to the Templars — Part 1 | 133 | July 19, 2012, 6:59 p.m. |
| Keyshanc — Part 1 | 2,000 | May 22, 2012, 2:14 p.m. |
| Number Sequence — Part 4 | 113 | April 25, 2012, 11:13 p.m. |
| ¿No Hablas Español? No problemo! | 200 | April 18, 2012, 8:27 p.m. |
| Number Sequence — Part 3 | 200 | March 31, 2012, 1:05 a.m. |
| Monoalphabetic Substitution with Camouflage — Part 5 | 2,000 | March 10, 2012, 6:17 p.m. |
| Partial Key Exposure with RSA — Part 1 | 2,000 | Feb. 11, 2012, 3:19 p.m. |
| AES key — encoded in the machine readable zone of a European ePassport | 1,576 | Jan. 22, 2012, 6:55 p.m. |
| Monoalphabetic substitution with camouflage — Part 2 | 1,824 | Dec. 9, 2011, 12:25 a.m. |
| Monoalphabetic substitution with camouflage — Part 3 | 1,824 | Dec. 8, 2011, 11:19 p.m. |
| Factorization Cipher — Part 2 | 1,824 | Dec. 2, 2011, 9:37 p.m. |
| Not-so-Secret Message from Malawi — Part II (ECC) | 1,152 | Nov. 28, 2011, 1:29 a.m. |
| Kaskade-S/T — Part 1 | 100 | Nov. 27, 2011, 4:32 p.m. |
| Kaskade-S/T — Part 2 | 1,172 | Nov. 27, 2011, 4:21 p.m. |
| Molehunt (Part 3/3) | 1,154 | Nov. 16, 2011, 4:01 a.m. |
| Ku Klux Klan | 1,000 | Nov. 13, 2011, 3:30 p.m. |
| An Invisible Message | 104 | Nov. 9, 2011, 2:47 a.m. |
| Unconcealed RSA messages | 1,725 | Nov. 4, 2011, 11:01 p.m. |
| One-Time Pad with Flaws | 100 | Oct. 20, 2011, 9:50 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 101 | Oct. 20, 2011, 9:20 p.m. |
| Lattice Part 1 | 1,181 | Oct. 20, 2011, 9:04 p.m. |
| Factorization Cipher — Part 1 | 150 | Oct. 18, 2011, 11:35 p.m. |
| Double Columnar Transposition | 133 | Oct. 14, 2011, 6:25 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,159 | Oct. 2, 2011, 1:59 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,159 | Oct. 2, 2011, 3:08 a.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 150 | Sept. 10, 2011, 11:53 p.m. |
| A really long number sequence | 2,000 | Sept. 6, 2011, 4:39 a.m. |
| Cracking SHA1-Hashed Passwords | 1,203 | Sept. 4, 2011, 1:56 a.m. |
| Modified Caesar Cipher | 200 | Sept. 2, 2011, 11:58 p.m. |
| Unusual encryption using a diophantine equation | 2,000 | Sept. 2, 2011, 10:53 p.m. |
| Smartcard RSA | 1,165 | Aug. 31, 2011, 1:53 a.m. |
| Hybrid Encryption I | 1,166 | Aug. 31, 2011, 1:37 a.m. |
| Alice's Birthday Party (Part 1) | 1,165 | Aug. 22, 2011, 12:28 a.m. |
| Alice's Birthday Party (Part 2) | 1,165 | Aug. 22, 2011, 12:17 a.m. |
| RSA: Two different keys — same ciphertext | 1,547 | Aug. 22, 2011, 12:04 a.m. |
| Broadcasting and low exponent — RSA Attack | 1,333 | Aug. 21, 2011, 11:39 p.m. |
| Number Sequence — Part 2 | 102 | Aug. 21, 2011, 8:41 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | June 20, 2011, 8:12 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | June 20, 2011, 7:57 p.m. |
| Number Sequence | 100 | June 20, 2011, 7:21 p.m. |
| Monoalphabetic Substitution | 100 | June 17, 2011, 8:41 p.m. |
| Molehunt (Part 1/3) | 100 | June 17, 2011, 8:06 p.m. |
| Original Caesar Cipher | 101 | June 17, 2011, 8:01 p.m. |
| Playfair Encryption | 101 | June 15, 2011, 3:41 a.m. |
Gold3
Silver1
Bronze2
