| Lightweight Introduction to Lattices — Part 3 | 1,315 | Aug. 22, 2020, 12:53 p.m. |
| Lightweight Introduction to Lattices — Part 2 | 102 | Aug. 22, 2020, 12:31 p.m. |
| Lightweight Introduction to Lattices — Part 1 | 101 | Aug. 22, 2020, 8:46 a.m. |
| Advent-Challenge — Part 2 | 1,260 | Feb. 22, 2018, 9:28 a.m. |
| Advent-Challenge — Part 1 | 101 | Feb. 21, 2018, 7:09 p.m. |
| CMEA 1 | 1,094 | March 5, 2017, 8:30 a.m. |
| Cascading Encryption — Part 1/3 | 100 | Feb. 23, 2017, 6:52 p.m. |
| ¿No Hablas Español? No problemo! | 100 | Feb. 22, 2017, 2:46 p.m. |
| Hybrid Encryption I | 1,094 | Feb. 22, 2017, 10 a.m. |
| Enigma Part 1 | 1,094 | Feb. 19, 2017, 12:49 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,094 | Feb. 19, 2017, 9:20 a.m. |
| Molehunt (Part 2/3) | 100 | Feb. 17, 2017, 8:13 a.m. |
| Molehunt (Part 1/3) | 100 | Feb. 15, 2017, 7:27 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,097 | Feb. 12, 2017, 10:44 a.m. |
| Unconcealed RSA messages | 1,099 | Feb. 12, 2017, 9:04 a.m. |
| Alice's Birthday Party (Part 2) | 1,094 | Feb. 10, 2017, 1 p.m. |
| Alice's Birthday Party (Part 1) | 1,094 | Feb. 10, 2017, 11:56 a.m. |
| Number Sequence — Part 4 | 100 | Feb. 5, 2017, 7:44 p.m. |
| The Book Code: A Challenge for Bookworms | 100 | Feb. 5, 2017, 7:15 p.m. |
| One-Time Pad with Flaws | 100 | Feb. 5, 2017, 12:48 p.m. |
| RSA: Two different keys — same ciphertext | 1,098 | Feb. 5, 2017, 11:03 a.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,094 | Feb. 4, 2017, 11:43 a.m. |
| Partial Key Exposure with RSA — Part 1 | 1,100 | Feb. 4, 2017, 9:18 a.m. |
| Unusual encryption using a diophantine equation | 1,098 | Jan. 22, 2017, 9:40 a.m. |
| Cracking SHA1-Hashed Passwords | 1,097 | Nov. 20, 2016, 1:11 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Nov. 20, 2016, 11:59 a.m. |
| Factorization Cipher — Part 1 | 100 | Nov. 13, 2016, 8:28 a.m. |
| A hidden word — Part 2 | 100 | Nov. 9, 2016, 2:40 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | Nov. 9, 2016, 1:43 p.m. |
| Monoalphabetic Substitution | 100 | Nov. 9, 2016, 12:20 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | Nov. 8, 2016, 8:44 p.m. |
| Number Sequence | 100 | Nov. 8, 2016, 8:01 p.m. |
| Snow White and the seven dwarfs | 100 | Nov. 6, 2016, 3:03 p.m. |
| Caesar Encryption | 100 | Nov. 6, 2016, 2:42 p.m. |
| Original Caesar Cipher | 100 | Nov. 6, 2016, 2:18 p.m. |
| Beaver Code | 100 | Nov. 6, 2016, 1:24 p.m. |
| Number Sequence — Part 2 | 100 | Nov. 6, 2016, 11:31 a.m. |
| A hidden word | 100 | Nov. 6, 2016, 11:05 a.m. |
| Letter to the Templars — Part 2 | 100 | Nov. 6, 2016, 10:58 a.m. |
| Letter to the Templars — Part 1 | 100 | Nov. 6, 2016, 10:47 a.m. |
| Letter to the Templars — Part 3 | 1,106 | Nov. 6, 2016, 10:29 a.m. |