| Advent-Challenge — Part 1 | 100 | July 16, 2018, 10:09 p.m. |
| Summer Job | 1,324 | July 16, 2018, 9:04 a.m. |
| Trendy Messenger | 1,327 | July 14, 2018, 7:56 p.m. |
| M-138 — Part 1 | 100 | Feb. 12, 2018, 6:10 p.m. |
| The Einstein Enigma | 1,725 | Feb. 10, 2018, 1:44 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,090 | Feb. 6, 2018, 8:25 p.m. |
| Monoalphabetic Substitution | 100 | Feb. 1, 2018, 4:08 p.m. |
| From Russia with Love | 100 | Oct. 9, 2017, 7:54 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,092 | June 12, 2017, 2:38 p.m. |
| Hybrid Encryption I | 1,093 | June 8, 2017, 10:26 p.m. |
| RSA: Two different keys — same ciphertext | 1,096 | June 8, 2017, 2:40 p.m. |
| Cracking SHA1-Hashed Passwords | 1,094 | June 6, 2017, 10:05 p.m. |
| Number Sequence — Part 8 | 100 | June 4, 2017, 6:53 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,096 | June 4, 2017, 1:51 p.m. |
| Modified Caesar Cipher | 100 | June 4, 2017, 7:36 a.m. |
| Alice's Birthday Party (Part 2) | 1,093 | June 3, 2017, 2:57 p.m. |
| Alice's Birthday Party (Part 1) | 1,093 | June 3, 2017, 12:35 p.m. |
| One-Time Pad with Flaws | 100 | May 28, 2017, 9:45 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | May 24, 2017, 10 a.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | May 23, 2017, 9:52 p.m. |
| Pigpen with a twist — Part 1 | 100 | March 1, 2017, 11:31 a.m. |
| How do you become a big cryptographer? | 100 | Feb. 28, 2017, 11:57 a.m. |
| A hidden word | 100 | Feb. 28, 2017, 11:27 a.m. |
| Nils away on travel | 100 | Feb. 26, 2017, 7:41 a.m. |
| Snow White and the seven dwarfs | 100 | Feb. 25, 2017, 10:07 a.m. |
| Grille Cipher | 100 | Feb. 22, 2017, 5:03 p.m. |
| Factorization Cipher — Part 1 | 100 | Feb. 22, 2017, 10:06 a.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Feb. 22, 2017, 9:17 a.m. |
| Letter to the Templars — Part 3 | 1,104 | Feb. 21, 2017, 12:48 p.m. |
| Number Sequence — Part 4 | 100 | Feb. 21, 2017, 11:43 a.m. |
| Number Sequence — Part 3 | 100 | Feb. 21, 2017, 11:23 a.m. |
| Letter to the Templars — Part 2 | 100 | Feb. 21, 2017, 11:13 a.m. |
| Letter to the Templars — Part 1 | 100 | Feb. 21, 2017, 9:55 a.m. |
| Beaver Code | 100 | Feb. 20, 2017, 10:38 p.m. |
| Caesar Encryption | 100 | Feb. 20, 2017, 11:55 a.m. |
| Original Caesar Cipher | 100 | Feb. 18, 2017, 8:37 p.m. |
| Number Sequence — Part 2 | 100 | Sept. 25, 2016, 2:05 p.m. |
| Number Sequence | 100 | Sept. 25, 2016, 1:39 p.m. |
Gold0
Silver0
Bronze0
