| RSA Factoring Challenge: RSA-240 | 0 | March 17, 2020, 4:26 p.m. |
| RSA Factoring Challenge: RSA-232 | 0 | March 17, 2020, 4:25 p.m. |
| RSA Factoring Challenge: RSA-704 | 0 | March 17, 2020, 4:25 p.m. |
| RSA Factoring Challenge: RSA-250 | 0 | March 17, 2020, 4:24 p.m. |
| M-138 — Part 3 | 1,102 | July 28, 2019, 7:22 p.m. |
| M-138 — Part 2 | 1,102 | July 28, 2019, 4:33 p.m. |
| M-138 — Part 1 | 100 | July 28, 2019, 4:28 p.m. |
| Advent-Challenge — Part 1 | 100 | July 28, 2019, 12:36 p.m. |
| Smartcard RSA | 1,086 | July 13, 2019, 5:27 p.m. |
| RSA Factoring Challenge: RSA-210 | 0 | Nov. 16, 2018, 1:12 p.m. |
| RSA Factoring Challenge: RSA-220 | 0 | Nov. 16, 2018, 1:10 p.m. |
| RSA Factoring Challenge: RSA-230 | 0 | Nov. 16, 2018, 1:08 p.m. |
| RSA: Two different keys — same ciphertext | 1,092 | May 15, 2018, 2:12 p.m. |
| Partial Key Exposure with RSA — Part 1 | 1,094 | May 12, 2018, 3:39 p.m. |
| Number Sequence — Part 8 | 100 | May 12, 2018, 3:18 p.m. |
| Enigma Messages with Repeated Letters — Part 4 | 100 | April 17, 2016, 6:06 p.m. |
| Enigma Messages with Repeated Letters — Part 5 | 100 | April 17, 2016, 6:01 p.m. |
| Enigma Messages with Repeated Letters — Part 2 | 100 | April 17, 2016, 5:58 p.m. |
| Enigma Messages with Repeated Letters — Part 3 | 100 | April 17, 2016, 5:51 p.m. |
| Enigma Part 2 | 1,097 | April 17, 2016, 4:56 p.m. |
| Enigma Part 1 | 1,097 | April 16, 2016, 10:12 p.m. |
| ECDH-Key Exchange for Beginners | 100 | Aug. 28, 2015, 1:09 p.m. |
| Pigpen with a twist — Part 1 | 100 | Aug. 20, 2015, 6:57 p.m. |
| Molehunt (Part 3/3) | 1,101 | Aug. 4, 2015, 10:01 p.m. |
| Molehunt (Part 2/3) | 100 | Aug. 4, 2015, 9:25 p.m. |
| Molehunt (Part 1/3) | 100 | Aug. 4, 2015, 9:06 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | Aug. 3, 2015, 6:55 p.m. |
| Recycled One-Time Pad | 100 | Aug. 3, 2015, 4:52 p.m. |
| Hybrid Encryption I | 1,101 | Aug. 3, 2015, 12:45 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,101 | Aug. 2, 2015, 9:54 p.m. |
| Classical Ciphers^3 | 100 | Aug. 2, 2015, 6:41 p.m. |
| Unusual encryption using a diophantine equation | 1,107 | Aug. 1, 2015, 4:19 p.m. |
| How do you become a big cryptographer? | 100 | July 17, 2015, 10:40 p.m. |
| Letter from the Alleged Countess Julie von Ortenburg | 100 | July 17, 2015, 3:45 p.m. |
| From Russia with Love | 100 | July 16, 2015, 10:29 p.m. |
| Modified Caesar Cipher | 100 | July 16, 2015, 6:54 p.m. |
| Reserve Hand Procedure — Part 1 | 100 | July 16, 2015, 5:55 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,101 | July 15, 2015, 11:13 p.m. |
| Broadcasting and low exponent — RSA Attack | 1,107 | July 15, 2015, 10:35 p.m. |
| Alice's Birthday Party (Part 2) | 1,101 | July 15, 2015, 10:19 p.m. |
| Cracking SHA1-Hashed Passwords | 1,104 | July 15, 2015, 9:47 p.m. |
| Alice's Birthday Party (Part 1) | 1,101 | July 15, 2015, 7:31 p.m. |
| Number Sequence — Part 7 | 101 | July 15, 2015, 5:47 p.m. |
| Number Sequence — Part 6 | 101 | July 15, 2015, 5:39 p.m. |
| A hidden word — Part 2 | 101 | July 15, 2015, 4:05 p.m. |
| Number Sequence — Part 5 | 100 | July 15, 2015, 3:53 p.m. |
| A really long number sequence | 1,107 | July 15, 2015, 3:06 p.m. |
| Snow White and the seven dwarfs | 100 | July 15, 2015, 12:21 a.m. |
| One-Time Pad with Flaws | 100 | July 14, 2015, 11:40 p.m. |
| Factorization Cipher — Part 3 | 1,110 | July 14, 2015, 12:59 a.m. |
| Factorization Cipher — Part 2 | 1,109 | July 13, 2015, 5:59 p.m. |
| Grille Cipher | 100 | July 13, 2015, 12:12 a.m. |
| A modified homophonic cipher with reduced alphabets — Part 2 | 100 | July 12, 2015, 11:46 p.m. |
| A modified homophonic cipher with reduced alphabets — Part 1 | 100 | July 12, 2015, 11:28 p.m. |
| Factorization Cipher — Part 1 | 100 | July 12, 2015, 10:32 p.m. |
| A hidden word | 100 | July 12, 2015, 1:30 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | July 12, 2015, 1:21 p.m. |
| Monoalphabetic Substitution | 100 | July 12, 2015, 12:52 p.m. |
| Letter to the Templars — Part 3 | 1,118 | July 11, 2015, 7:10 p.m. |
| Letter to the Templars — Part 2 | 100 | July 11, 2015, 6:40 p.m. |
| Letter to the Templars — Part 1 | 100 | July 11, 2015, 6:29 p.m. |
| Number Sequence — Part 4 | 100 | July 11, 2015, 12:18 a.m. |
| Number Sequence — Part 3 | 100 | July 10, 2015, 5:14 p.m. |
| Beaver Code | 100 | July 10, 2015, 5:11 p.m. |
| Caesar Encryption | 100 | July 9, 2015, 11:51 p.m. |
| Number Sequence — Part 2 | 100 | July 9, 2015, 6:04 p.m. |
| Original Caesar Cipher | 100 | July 9, 2015, 5:55 p.m. |
| Number Sequence | 100 | July 9, 2015, 5:20 p.m. |
Gold0
Silver1
Bronze1
