| M-138 — Part 2 | 1,576 | Dec. 29, 2014, 10:13 p.m. |
| M-138 — Part 3 | 1,613 | Dec. 28, 2014, 1:29 p.m. |
| M-138 — Part 1 | 133 | Dec. 26, 2014, 2:09 p.m. |
| Kaskade-S/T — Part 3 | 1,108 | Dec. 8, 2014, 10:37 p.m. |
| Strange Message from Thessaloniki | 100 | Dec. 7, 2014, 6:01 a.m. |
| Purple 1 | 1,106 | Dec. 4, 2014, 11:41 p.m. |
| Keyshanc — Part 2 | 1,121 | Nov. 28, 2014, 5:11 p.m. |
| Kaskade-S/T — Part 2 | 1,108 | Nov. 26, 2014, 5:33 p.m. |
| Kaskade-S/T — Part 1 | 100 | Nov. 26, 2014, 1:31 a.m. |
| A Secret Message from Castle Mansfeld | 100 | Nov. 22, 2014, 8 p.m. |
| Zodiac Cipher | 100 | Nov. 21, 2014, 6:55 p.m. |
| Not-so-Secret Message from Malawi — Part II (ECC) | 1,106 | Nov. 20, 2014, 7:52 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Nov. 18, 2014, 9:07 p.m. |
| Pigpen with a twist — Part 3 | 1,113 | Nov. 18, 2014, 8:04 p.m. |
| Pigpen with a twist — Part 2 | 1,113 | Nov. 18, 2014, 7:58 p.m. |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 1,108 | Nov. 14, 2014, 9:51 p.m. |
| Monoalphabetic substitution with camouflage — Part 4 | 100 | Nov. 13, 2014, 3:49 p.m. |
| Monoalphabetic Substitution with Camouflage — Part 5 | 1,119 | Nov. 13, 2014, 1:37 a.m. |
| Monoalphabetic substitution with camouflage — Part 3 | 1,116 | Nov. 13, 2014, midnight |
| Monoalphabetic substitution with camouflage — Part 2 | 1,116 | Nov. 12, 2014, 8:11 p.m. |
| Keyshanc — Part 1 | 1,122 | Nov. 10, 2014, 8:30 p.m. |
| Unusual encryption using a diophantine equation | 1,113 | Nov. 10, 2014, 7:48 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | Nov. 10, 2014, 7:11 p.m. |
| Pigpen with a twist — Part 1 | 100 | Nov. 10, 2014, 4:56 p.m. |
| How do you become a big cryptographer? | 100 | Nov. 8, 2014, 1:46 p.m. |
| Cascading Encryption — Part 1/3 | 100 | Nov. 8, 2014, 2:18 a.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Nov. 7, 2014, 11:56 p.m. |
| Molehunt (Part 3/3) | 1,106 | Nov. 7, 2014, 4:30 p.m. |
| An 'unhearable' message | 100 | Nov. 6, 2014, 8:50 p.m. |
| An Invisible Message | 100 | Nov. 6, 2014, 7:46 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Nov. 6, 2014, 5:39 a.m. |
| Hybrid Encryption I | 1,106 | Nov. 5, 2014, 2:55 p.m. |
| RSA Factoring Challenge: RSA-704 | 0 | Nov. 5, 2014, 2:46 p.m. |
| Recycled One-Time Pad | 100 | Nov. 5, 2014, 2:45 p.m. |
| ECDH-Key Exchange for Beginners | 100 | Nov. 3, 2014, 10:27 p.m. |
| Classical Ciphers^3 | 100 | Nov. 3, 2014, 9:54 p.m. |
| A hidden word | 100 | Nov. 3, 2014, 4:38 a.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Nov. 3, 2014, 4:35 a.m. |
| Beaver Code | 100 | Nov. 3, 2014, 4:30 a.m. |
| Multilingual Monoalphabetic Substitution | 100 | Oct. 31, 2014, 3:18 p.m. |
| Playfair with hints about the grid | 100 | Oct. 30, 2014, 7:59 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | Oct. 30, 2014, 7:24 p.m. |
| Snow White and the seven dwarfs | 100 | Oct. 30, 2014, 6:51 p.m. |
| The Last Note | 113 | Sept. 30, 2014, 7:49 p.m. |
| Heartbleed — Part 3 | 1,660 | Aug. 31, 2014, 11:43 p.m. |
| Heartbleed — Part 2 | 150 | Aug. 30, 2014, 4:13 a.m. |
| Heartbleed — Part 1 | 150 | Aug. 30, 2014, 12:23 a.m. |
| Nils away on travel | 100 | July 11, 2014, 4:51 a.m. |
| Alice's Birthday Party (Part 2) | 1,109 | July 5, 2014, 5:29 a.m. |
| Alice's Birthday Party (Part 1) | 1,109 | July 3, 2014, 9:41 p.m. |
| Double Column Transposition — Part 5 | 1,469 | July 3, 2014, 7:02 p.m. |
| Double Column Transposition — Part 1 | 1,238 | July 2, 2014, 8:13 p.m. |
| ADFGVX — Part 1 | 100 | July 2, 2014, 4:58 p.m. |
| Double Column Transposition — Part 4 | 1,298 | July 2, 2014, 1:03 p.m. |
| From Russia with Love | 100 | July 1, 2014, 9:08 p.m. |
| ADFGVX — Part 2 | 100 | July 1, 2014, 6 p.m. |
| Double Column Transposition — Part 2 | 1,270 | June 30, 2014, 5:45 p.m. |
| Trifid Cipher | 100 | June 28, 2014, 4:56 p.m. |
| Double Column Transposition — Part 3 | 1,276 | June 26, 2014, 10:50 p.m. |
| Double Columnar Transposition | 100 | June 26, 2014, 12:15 a.m. |
| Enigma Messages with Repeated Letters — Part 5 | 101 | June 23, 2014, 5:12 p.m. |
| Enigma Messages with Repeated Letters — Part 4 | 101 | June 23, 2014, 5:08 p.m. |
| Hill Cipher with Sudoku Key | 100 | June 21, 2014, 4:19 a.m. |
| Enigma Messages with Repeated Letters — Part 3 | 101 | June 21, 2014, 3:18 a.m. |
| A really long number sequence | 1,118 | June 20, 2014, 10:23 p.m. |
| Typex — Part 1 | 1,163 | Jan. 18, 2014, 1:22 a.m. |
| Enigma Combinatorics | 100 | Jan. 14, 2014, 9:24 p.m. |
| Sigaba Part 1 | 1,113 | Dec. 21, 2013, 12:33 p.m. |
| Modified Caesar Cipher | 100 | Dec. 14, 2013, 3:39 p.m. |
| Grille Cipher | 100 | Dec. 13, 2013, 1:02 a.m. |
| Molehunt (Part 2/3) | 100 | Dec. 11, 2013, 10:54 p.m. |
| Molehunt (Part 1/3) | 100 | Dec. 11, 2013, 10:49 p.m. |
| Playfair Encryption | 100 | Dec. 11, 2013, 3:34 p.m. |
| One-Time Pad with Flaws | 100 | Dec. 10, 2013, 9:46 p.m. |
| AES key — encoded in the machine readable zone of a European ePassport | 1,131 | Dec. 10, 2013, 8:41 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,114 | Dec. 10, 2013, 6:41 p.m. |
| Monoalphabetic Substitution | 100 | Dec. 10, 2013, 5:46 p.m. |
| Caesar Encryption | 100 | Dec. 10, 2013, 4:56 p.m. |
| Original Caesar Cipher | 100 | Dec. 10, 2013, 4:48 p.m. |
| RSA Factoring Challenge: RSA-210 | 0 | Dec. 1, 2013, 7:58 p.m. |
| ORYX Stream Cipher — Part 3 (revised) | 1,194 | Dec. 1, 2013, 6:21 a.m. |
| Unconcealed RSA messages | 1,128 | Nov. 29, 2013, 5:59 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | Nov. 28, 2013, 4:34 a.m. |
| Monoalphabetic substitution with camouflage — Part 1 | 100 | Nov. 28, 2013, 12:03 a.m. |
| Music Code — Part 2 | 1,121 | Nov. 27, 2013, 10:32 p.m. |
| Music Code — Part 1 | 100 | Nov. 27, 2013, 10:31 p.m. |
| ORYX Stream Cipher Part II | 1,114 | Nov. 27, 2013, 6:44 p.m. |
| RSA with Special d | 13,607 | Nov. 26, 2013, 7:28 p.m. |
| ORYX Stream Cipher Part I | 1,114 | Nov. 26, 2013, 3:34 p.m. |
| CMEA 2 | 13,631 | Nov. 24, 2013, 11:47 p.m. |
| Smartcard RSA | 1,114 | Nov. 22, 2013, 4:11 p.m. |
| CMEA 1 | 1,116 | Nov. 21, 2013, 10:48 p.m. |
| ¿No Hablas Español? No problemo! | 100 | Nov. 21, 2013, 4:03 p.m. |
| Letter to the Templars — Part 2 | 100 | Nov. 21, 2013, 3:30 p.m. |
| Letter to the Templars — Part 1 | 100 | Nov. 21, 2013, 3:28 p.m. |
| Letter to the Templars — Part 3 | 1,152 | Nov. 21, 2013, 4:19 a.m. |
| Number Sequence — Part 5 | 100 | Nov. 21, 2013, 3:38 a.m. |
| Number Sequence — Part 4 | 100 | Nov. 20, 2013, 10:47 p.m. |
| Number Sequence — Part 3 | 100 | Nov. 20, 2013, 10:42 p.m. |
| Number Sequence — Part 2 | 100 | Nov. 20, 2013, 10:41 p.m. |
| Number Sequence | 100 | Nov. 20, 2013, 10:39 p.m. |
| Partial Key Exposure with RSA — Part 1 | 1,134 | Nov. 17, 2013, 10:03 p.m. |
| Factorization Cipher — Part 3 | 1,132 | Nov. 17, 2013, 9:44 p.m. |
| Cracking SHA1-Hashed Passwords | 1,120 | Nov. 16, 2013, 7:28 p.m. |
| BCR code (Book-Caesar-RSA) | 1,150 | Nov. 15, 2013, 8:02 p.m. |
| Enigma Messages with Repeated Letters — Part 2 | 106 | Nov. 13, 2013, 11:30 p.m. |
| Turing Bombe Enigma I | 100 | Nov. 13, 2013, 5:14 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 102 | Nov. 13, 2013, 5:21 a.m. |
| Enigma Part 2 | 1,114 | Nov. 12, 2013, 10:16 p.m. |
| Enigma Messages | 100 | Nov. 12, 2013, 4:25 p.m. |
| RSA: Two different keys — same ciphertext | 1,125 | Nov. 11, 2013, 10:26 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,114 | Nov. 11, 2013, 9:46 p.m. |
| Enigma Part 1 | 1,115 | Nov. 6, 2013, 4:47 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,124 | Nov. 6, 2013, 4:14 p.m. |
| Factorization Cipher — Part 2 | 1,130 | Nov. 6, 2013, 12:03 a.m. |
| Factorization Cipher — Part 1 | 100 | Nov. 5, 2013, 10:03 p.m. |
Gold1
Silver0
Bronze1
