| Partial Key Exposure with RSA — Part 1 | 1,086 | Nov. 16, 2020, 2:04 a.m. |
| Lightweight Introduction to Lattices — Part 2 | 101 | Nov. 15, 2020, 8:35 p.m. |
| Lightweight Introduction to Lattices — Part 1 | 101 | Nov. 15, 2020, 7:48 p.m. |
| Playfair with hints about the grid | 100 | Nov. 15, 2020, 6:50 p.m. |
| Playfair Encryption | 100 | Nov. 15, 2020, 6:45 p.m. |
| Enigma Part 1 | 1,083 | Nov. 15, 2020, 6:31 p.m. |
| Enigma Part 2 | 1,083 | Nov. 15, 2020, 6:11 p.m. |
| Advent Challenge — Part 4 | 1,116 | Nov. 15, 2020, 5:38 p.m. |
| Advent Challenge — Part 3 | 1,116 | Nov. 15, 2020, 2:11 p.m. |
| Advent-Challenge — Part 2 | 1,116 | Nov. 15, 2020, 1:41 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | Nov. 15, 2020, 4:23 a.m. |
| Molehunt (Part 3/3) | 1,083 | Nov. 15, 2020, 3:35 a.m. |
| Molehunt (Part 2/3) | 100 | Nov. 15, 2020, 3:27 a.m. |
| Molehunt (Part 1/3) | 100 | Nov. 15, 2020, 3:24 a.m. |
| Number Sequence — Part 7 | 100 | Nov. 15, 2020, 12:56 a.m. |
| M-138 — Part 1 | 100 | Nov. 15, 2020, 12:27 a.m. |
| Number Sequence — Part 9 | 100 | Nov. 15, 2020, 12:18 a.m. |
| Number Sequence — Part 6 | 100 | Nov. 15, 2020, 12:12 a.m. |
| Number Sequence — Part 10 | 100 | Nov. 15, 2020, 12:08 a.m. |
| A really long number sequence | 1,085 | Nov. 14, 2020, 11:37 p.m. |
| M-138 — Part 3 | 1,096 | Nov. 14, 2020, 9:34 p.m. |
| M-138 — Part 2 | 1,096 | Nov. 14, 2020, 9:21 p.m. |
| Advent-Challenge — Part 1 | 100 | Nov. 14, 2020, 8:13 p.m. |
| Number Sequence — Part 8 | 100 | Aug. 27, 2016, 12:18 a.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,096 | Aug. 24, 2016, 12:50 a.m. |
| Modified Caesar Cipher | 100 | Aug. 22, 2016, 6:32 p.m. |
| From Russia with Love | 100 | Aug. 22, 2016, 5:30 p.m. |
| Hybrid Encryption I | 1,096 | Aug. 22, 2016, 2:48 p.m. |
| RSA: Two different keys — same ciphertext | 1,100 | Aug. 22, 2016, 5:45 a.m. |
| Broadcasting and low exponent — RSA Attack | 1,100 | Aug. 22, 2016, 4:17 a.m. |
| Alice's Birthday Party (Part 2) | 1,096 | Aug. 22, 2016, 3:11 a.m. |
| Alice's Birthday Party (Part 1) | 1,096 | Aug. 22, 2016, 2:35 a.m. |
| One-Time Pad with Flaws | 100 | Sept. 9, 2014, 7:52 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Sept. 8, 2014, 11:20 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Sept. 8, 2014, 11:06 p.m. |
| Pigpen with a twist — Part 1 | 100 | Sept. 8, 2014, 10:19 p.m. |
| Factorization Cipher — Part 2 | 1,118 | Sept. 7, 2014, 4:33 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,107 | Sept. 6, 2014, 3:15 p.m. |
| Number Sequence — Part 5 | 100 | June 22, 2014, 4:43 p.m. |
| Cracking SHA1-Hashed Passwords | 1,116 | Feb. 23, 2014, 3:40 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Feb. 8, 2014, 10:04 p.m. |
| Monoalphabetic Substitution | 100 | Feb. 8, 2014, 9:27 p.m. |
| Snow White and the seven dwarfs | 100 | Feb. 8, 2014, 6:43 p.m. |
| Number Sequence — Part 4 | 100 | Feb. 8, 2014, 6:04 p.m. |
| How do you become a big cryptographer? | 100 | Jan. 21, 2014, 9:10 p.m. |
| Grille Cipher | 100 | Jan. 21, 2014, 7:38 p.m. |
| A hidden word | 100 | Jan. 20, 2014, 11:44 p.m. |
| Letter to the Templars — Part 2 | 100 | Jan. 19, 2014, 9:44 p.m. |
| Letter to the Templars — Part 3 | 1,147 | Jan. 15, 2014, 12:12 a.m. |
| Factorization Cipher — Part 1 | 100 | Jan. 14, 2014, 11:51 p.m. |
| Letter to the Templars — Part 1 | 100 | Jan. 14, 2014, 11:40 p.m. |
| Number Sequence — Part 3 | 100 | Jan. 14, 2014, 10:25 p.m. |
| Number Sequence | 100 | Jan. 13, 2014, 7:38 p.m. |
| Beaver Code | 100 | Jan. 13, 2014, 7:09 p.m. |
| Caesar Encryption | 100 | Jan. 13, 2014, 6:43 p.m. |
| Number Sequence — Part 2 | 100 | Jan. 13, 2014, 6:21 p.m. |
| Original Caesar Cipher | 100 | Jan. 13, 2014, 5:49 p.m. |