| From Russia with Love | 100 | Oct. 10, 2021, 7:05 p.m. |
| Snow White and the seven dwarfs | 100 | Oct. 10, 2021, 2:46 p.m. |
| Number Sequence — Part 8 | 100 | Oct. 9, 2021, 9:35 a.m. |
| Advent-Challenge — Part 1 | 100 | Oct. 9, 2021, 8:55 a.m. |
| Grille Cipher | 100 | Oct. 8, 2021, 9:06 a.m. |
| A hidden word | 100 | Sept. 15, 2016, 6:19 p.m. |
| Beaver Code | 100 | Sept. 15, 2016, 6:10 p.m. |
| Double Column Transposition — Part 5 | 1,362 | July 16, 2014, 6:54 p.m. |
| Double Column Transposition — Part 2 | 1,252 | July 15, 2014, 5:29 p.m. |
| Double Column Transposition — Part 3 | 1,252 | July 15, 2014, 5:09 p.m. |
| Double Column Transposition — Part 1 | 1,229 | July 15, 2014, 4:29 p.m. |
| Substitution Cipher with Non-Prefix Codes | 13,959 | Jan. 14, 2013, 7:53 a.m. |
| Letter to the Templars — Part 3 | 1,310 | Nov. 16, 2012, 7:25 p.m. |
| Monoalphabetic Substitution with Camouflage — Part 6 | 1,209 | Nov. 16, 2012, 3:13 p.m. |
| Keyshanc — Part 2 | 1,239 | Aug. 18, 2012, 6:38 p.m. |
| Number Sequence — Part 4 | 101 | Aug. 16, 2012, 6:37 p.m. |
| Number Sequence — Part 3 | 101 | Aug. 16, 2012, 6:33 p.m. |
| Letter to the Templars — Part 2 | 106 | Aug. 16, 2012, 6:27 p.m. |
| Letter to the Templars — Part 1 | 103 | Aug. 16, 2012, 7:19 a.m. |
| Kaskade-S/T — Part 5 | 1,146 | Aug. 15, 2012, 5:17 p.m. |
| Keyshanc — Part 1 | 1,266 | July 23, 2012, 6:41 p.m. |
| Monoalphabetic Substitution with Camouflage — Part 5 | 1,547 | March 16, 2012, 8:59 p.m. |
| Partial Key Exposure with RSA — Part 1 | 1,824 | Feb. 12, 2012, 2:49 p.m. |
| Smartcard RSA | 1,149 | Jan. 14, 2012, 12:11 p.m. |
| Double Columnar Transposition | 101 | Jan. 13, 2012, 5:52 p.m. |
| Molehunt (Part 3/3) | 1,148 | Jan. 13, 2012, 5:11 p.m. |
| Kaskade-S/T — Part 3 | 1,165 | Jan. 6, 2012, 2:53 p.m. |
| ADFGVX — Part 2 | 101 | Dec. 30, 2011, 10:48 p.m. |
| An Invisible Message | 101 | Dec. 29, 2011, 2:09 p.m. |
| ADFGVX — Part 1 | 101 | Dec. 28, 2011, 7:46 p.m. |
| Monoalphabetic substitution with camouflage — Part 3 | 1,391 | Dec. 25, 2011, 6:42 p.m. |
| Monoalphabetic substitution with camouflage — Part 2 | 1,398 | Dec. 25, 2011, 3:06 a.m. |
| Factorization Cipher — Part 2 | 1,367 | Dec. 24, 2011, 8:11 p.m. |
| Molehunt (Part 2/3) | 100 | Dec. 17, 2011, 11:45 p.m. |
| Molehunt (Part 1/3) | 100 | Dec. 12, 2011, 10:22 a.m. |
| Pigpen with a twist — Part 3 | 1,235 | Dec. 5, 2011, 4:19 p.m. |
| Pigpen with a twist — Part 2 | 1,238 | Nov. 30, 2011, 12:23 p.m. |
| Factorization Cipher — Part 1 | 150 | Oct. 19, 2011, 10:50 a.m. |
| Pigpen with a twist — Part 1 | 104 | Oct. 1, 2011, 4:34 p.m. |
| Unusual encryption using a diophantine equation | 1,469 | Sept. 12, 2011, 7:11 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 200 | Sept. 9, 2011, 1:31 p.m. |
| A really long number sequence | 1,660 | Sept. 9, 2011, 12:57 p.m. |
| Kaskade-S/T — Part 2 | 1,196 | Aug. 22, 2011, 2:17 p.m. |
| Purple 1 | 1,167 | Aug. 19, 2011, 7:18 p.m. |
| RSA: Two different keys — same ciphertext | 1,824 | Aug. 16, 2011, 10:09 p.m. |
| Kaskade-S/T — Part 1 | 101 | Aug. 16, 2011, 1:06 p.m. |
| Hybrid Encryption I | 1,169 | Aug. 13, 2011, 1:11 a.m. |
| Enigma Part 2 | 1,166 | Aug. 12, 2011, 11:31 p.m. |
| Enigma Part 1 | 1,169 | July 28, 2011, 11:26 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,169 | July 24, 2011, 9:20 p.m. |
| Broadcasting and low exponent — RSA Attack | 2,000 | July 23, 2011, 3:36 p.m. |
| Alice's Birthday Party (Part 2) | 1,169 | July 23, 2011, 3:03 p.m. |
| Alice's Birthday Party (Part 1) | 1,170 | July 23, 2011, 12:41 p.m. |
| A Secret Message from Castle Mansfeld | 100 | July 17, 2011, 3:29 a.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,171 | July 16, 2011, 6:46 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | July 16, 2011, 3:39 p.m. |
| One-Time Pad with Flaws | 100 | July 15, 2011, 10:20 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | July 15, 2011, 6:27 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | July 15, 2011, 5:26 p.m. |
| Cracking SHA1-Hashed Passwords | 1,230 | July 14, 2011, 4:42 p.m. |
| Monoalphabetic Substitution | 100 | July 12, 2011, 11:02 a.m. |
| Number Sequence — Part 2 | 200 | July 11, 2011, 7:09 p.m. |
| Original Caesar Cipher | 100 | July 9, 2011, 4:47 p.m. |
| Caesar Encryption | 100 | July 9, 2011, 4:23 p.m. |
| Number Sequence | 100 | July 9, 2011, 3:03 p.m. |
Gold3
Silver2
Bronze1
