| Advent-Challenge — Part 2 | 1,824 | Dec. 17, 2017, 9:40 p.m. |
| RSA Factoring Challenge: RSA-220 | 0 | Dec. 8, 2017, 9:34 p.m. |
| Number Sequence — Part 9 | 104 | Dec. 8, 2017, 9:29 p.m. |
| Advent-Challenge — Part 1 | 200 | Dec. 8, 2017, 8:51 p.m. |
| New Year's Greetings — Part 4 | 133 | March 23, 2016, 7:58 p.m. |
| New Year's Greetings — Part 3 | 133 | March 23, 2016, 7:34 p.m. |
| New Year's Greetings — Part 2 | 133 | March 23, 2016, 7:21 p.m. |
| New Year's Greetings — Part 1 | 133 | March 23, 2016, 6:41 p.m. |
| Cascading Encryption — Part 1/3 | 100 | March 23, 2016, 6:22 p.m. |
| Heartbleed — Part 3 | 1,140 | Feb. 29, 2016, 9:47 p.m. |
| Heartbleed — Part 2 | 100 | Feb. 29, 2016, 9:47 p.m. |
| Heartbleed — Part 1 | 100 | Feb. 29, 2016, 9:46 p.m. |
| News from Castle Mansfeld | 101 | Feb. 12, 2016, 11:06 p.m. |
| Number Sequence — Part 8 | 101 | Feb. 11, 2016, 12:35 a.m. |
| Image Noise | 101 | Feb. 11, 2016, 12:34 a.m. |
| Beaver Code | 100 | Feb. 11, 2016, 12:33 a.m. |
| Monoalphabetic Substitution with Camouflage — Part 5 | 1,113 | May 14, 2015, 8:38 p.m. |
| Monoalphabetic substitution with camouflage — Part 4 | 100 | May 14, 2015, 12:13 a.m. |
| Monoalphabetic substitution with camouflage — Part 3 | 1,111 | May 13, 2015, 6:35 p.m. |
| RSA Factoring Challenge: RSA-210 | 0 | April 23, 2015, 10:59 a.m. |
| RSA Factoring Challenge: RSA-704 | 0 | April 23, 2015, 10:58 a.m. |
| Monoalphabetic substitution with camouflage — Part 2 | 1,112 | April 18, 2015, 3:33 p.m. |
| Monoalphabetic substitution with camouflage — Part 1 | 100 | April 17, 2015, 9:39 p.m. |
| A hidden word — Part 2 | 200 | April 16, 2015, 10:37 p.m. |
| Pigpen with a twist — Part 3 | 1,109 | April 14, 2015, 8:43 p.m. |
| Pigpen with a twist — Part 1 | 100 | April 14, 2015, 8:43 p.m. |
| Number Sequence — Part 7 | 133 | March 25, 2015, 8:01 p.m. |
| Number Sequence — Part 6 | 150 | March 25, 2015, 11:19 a.m. |
| Concealed Messages — Vigenère's Night Sky | 1,117 | Feb. 17, 2015, 12:22 p.m. |
| Music Code — Part 2 | 1,109 | Feb. 3, 2015, 6:37 p.m. |
| Music Code — Part 1 | 100 | Feb. 3, 2015, 6:37 p.m. |
| Factorization Cipher — Part 3 | 1,114 | Feb. 3, 2015, 12:55 a.m. |
| Factorization Cipher — Part 2 | 1,113 | Feb. 3, 2015, 12:55 a.m. |
| Playfair with hints about the grid | 100 | Jan. 27, 2015, 8:41 p.m. |
| Playfair Encryption | 100 | Jan. 27, 2015, 8:40 p.m. |
| Recycled One-Time Pad | 100 | Jan. 26, 2015, 10:13 p.m. |
| M-138 — Part 2 | 1,330 | Jan. 25, 2015, 12:07 a.m. |
| M-138 — Part 1 | 103 | Jan. 24, 2015, 8:22 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,104 | Jan. 24, 2015, 2:19 p.m. |
| Classical Ciphers^3 | 100 | Jan. 22, 2015, 10:32 p.m. |
| ¿No Hablas Español? No problemo! | 100 | Jan. 20, 2015, 11:55 p.m. |
| An 'unhearable' message | 100 | Jan. 19, 2015, 10:30 p.m. |
| ADFGVX — Part 2 | 100 | Jan. 16, 2015, 7:37 p.m. |
| ADFGVX — Part 1 | 100 | Jan. 16, 2015, 7:36 p.m. |
| Multilingual Monoalphabetic Substitution | 100 | Jan. 15, 2015, 10:28 p.m. |
| An Invisible Message | 100 | Jan. 15, 2015, 9:59 p.m. |
| Cracking SHA1-Hashed Passwords | 1,108 | Jan. 14, 2015, 11:33 p.m. |
| Hill Cipher with Sudoku Key | 100 | Jan. 14, 2015, 10:04 p.m. |
| The Last Note | 101 | Jan. 11, 2015, 3:17 a.m. |
| Strange Message from Thessaloniki | 100 | Jan. 11, 2015, 12:50 a.m. |
| ECDH-Key Exchange for Beginners | 100 | Jan. 10, 2015, 8:55 p.m. |
| How do you become a big cryptographer? | 100 | Jan. 9, 2015, 1:42 a.m. |
| Zodiac Cipher | 100 | Jan. 9, 2015, 12:43 a.m. |
| Trifid Cipher | 100 | Dec. 22, 2014, 11:55 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Dec. 22, 2014, 11:42 p.m. |
| From Russia with Love | 100 | Dec. 22, 2014, 11:41 p.m. |
| Nils away on travel | 100 | Dec. 22, 2014, 11:41 p.m. |
| Double Columnar Transposition | 100 | Dec. 9, 2014, 7:52 p.m. |
| A Secret Message from Castle Mansfeld | 100 | Dec. 6, 2014, 5:06 p.m. |
| Molehunt (Part 3/3) | 1,106 | Dec. 6, 2014, 5:03 p.m. |
| Molehunt (Part 2/3) | 100 | Dec. 6, 2014, 5:03 p.m. |
| Molehunt (Part 1/3) | 100 | Dec. 6, 2014, 5:02 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | Nov. 27, 2014, 7:39 p.m. |
| A hidden word | 100 | Nov. 26, 2014, 7:19 p.m. |
| Snow White and the seven dwarfs | 100 | Nov. 26, 2014, 7:15 p.m. |
| A really long number sequence | 1,113 | Nov. 25, 2014, 11:27 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Nov. 25, 2014, 7:26 p.m. |
| Number Sequence — Part 5 | 100 | Nov. 24, 2014, 9:30 p.m. |
| Factorization Cipher — Part 1 | 100 | Nov. 24, 2014, 5:43 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | Nov. 23, 2014, 2:57 p.m. |
| Modified Caesar Cipher | 100 | Nov. 22, 2014, 5:46 p.m. |
| One-Time Pad with Flaws | 100 | Nov. 22, 2014, 2:06 p.m. |
| Grille Cipher | 100 | Nov. 21, 2014, 8:45 p.m. |
| Monoalphabetic Substitution | 100 | Nov. 21, 2014, 8:21 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Nov. 21, 2014, 12:22 a.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Nov. 20, 2014, 10:53 p.m. |
| Letter to the Templars — Part 3 | 1,127 | Nov. 20, 2014, 12:33 a.m. |
| Letter to the Templars — Part 2 | 100 | Nov. 20, 2014, 12:19 a.m. |
| Letter to the Templars — Part 1 | 100 | Nov. 20, 2014, 12:04 a.m. |
| Caesar Encryption | 100 | Nov. 19, 2014, 11:42 p.m. |
| Original Caesar Cipher | 100 | Nov. 19, 2014, 10:36 p.m. |
| Number Sequence — Part 4 | 100 | Nov. 19, 2014, 9:44 p.m. |
| Number Sequence — Part 3 | 100 | Nov. 19, 2014, 9:32 p.m. |
| Number Sequence — Part 2 | 100 | Nov. 19, 2014, 9:23 p.m. |
| Number Sequence | 100 | Nov. 19, 2014, 9:20 p.m. |
Gold0
Silver0
Bronze1
