| The Heavy T52 Sturgeon Challenge — Part 4 | 13,613 | May 14, 2023, 11:09 a.m. |
| The Heavy T52 Sturgeon Challenge — Part 5 | 13,619 | May 7, 2023, 10:05 a.m. |
| The Heavy T52 Sturgeon Challenge — Part 6 | 13,638 | March 26, 2023, 10:31 p.m. |
| The LoRa Cipher: Logic Randomness — Part 1 | 1,116 | Jan. 22, 2023, 10:01 p.m. |
| The SZ42 Challenge — Part 9 | 1,127 | Jan. 22, 2023, 4:38 p.m. |
| The SZ42 Challenge — Part 5 | 1,123 | Jan. 22, 2023, 4:19 p.m. |
| The SZ42 Challenge — Part 4 | 1,123 | Jan. 22, 2023, 4:02 p.m. |
| The SZ42 Challenge — Part 6 | 1,124 | Jan. 22, 2023, 12:10 p.m. |
| The SZ42 Challenge — Part 7 | 1,125 | Jan. 22, 2023, 11:15 a.m. |
| The SZ42 Challenge — Part 8 | 1,125 | Jan. 21, 2023, 8:52 p.m. |
| The Heavy T52 Sturgeon Challenge — Part 2 | 13,766 | Jan. 16, 2022, 3:12 p.m. |
| The SZ42 Challenge — Part 13 | 1,398 | Oct. 24, 2021, 10:32 a.m. |
| The SZ42 Challenge — Part 12 | 1,398 | Oct. 23, 2021, 1:48 p.m. |
| SIGABA CSP-2900 — Part 1 | 1,824 | Aug. 2, 2021, 1:47 a.m. |
| SIGABA CSP-2900 — Part 2 | 2,000 | Aug. 1, 2021, 3:13 p.m. |
| SIGABA CSP-2900 — Part 3 | 20,000 | Aug. 1, 2021, 9:36 a.m. |
| SIGABA CSP-889 — Part 2 | 1,824 | June 3, 2021, 6:45 a.m. |
| SIGABA CSP-889 — Part 3 | 20,000 | June 2, 2021, 12:03 p.m. |
| SIGABA CSP-889 — Part 1 | 2,000 | June 2, 2021, 10:40 a.m. |
| The SIGABA Challenge — Part 6 | 14,326 | Feb. 7, 2021, 9:35 p.m. |
| The T52 Sturgeon Challenge — Part 9 | 1,142 | Jan. 10, 2021, 3:04 p.m. |
| The Heavy T52 Sturgeon Challenge — Part 7 | 14,427 | Jan. 10, 2021, 2:34 p.m. |
| The T52 Sturgeon Challenge — Part 12 | 1,143 | Dec. 30, 2020, 11:21 p.m. |
| The T52 Sturgeon Challenge — Part 11 | 1,143 | Dec. 30, 2020, 4:24 p.m. |
| The T52 Sturgeon Challenge — Part 10 | 1,143 | Dec. 30, 2020, 4:22 p.m. |
| The T52 Sturgeon Challenge — Part 8 | 1,143 | Dec. 30, 2020, 8:06 a.m. |
| The Heavy T52 Sturgeon Challenge — Part 3 | 14,126 | Dec. 29, 2020, 6:50 p.m. |
| The SZ42 Challenge — Part 2 | 1,292 | Sept. 20, 2020, 8:55 p.m. |
| The SZ42 Challenge — Part 1 | 1,270 | Sept. 20, 2020, 10:56 a.m. |
| The T52 Sturgeon Challenge — Part 3 | 1,151 | Sept. 13, 2020, 8:41 p.m. |
| The T52 Sturgeon Challenge — Part 2 | 1,152 | Sept. 10, 2020, 7:36 a.m. |
| The T52 Sturgeon Challenge — Part 4 | 1,152 | Sept. 8, 2020, 5:05 p.m. |
| The T52 Sturgeon Challenge — Part 1 | 1,151 | Sept. 8, 2020, 5:03 p.m. |
| The SIGABA Challenge — Part 5 | 20,000 | March 26, 2020, 1:34 p.m. |
| The SIGABA Challenge — Part 4 | 20,000 | March 17, 2020, 8:56 p.m. |
| The SIGABA Challenge — Part 3 | 20,000 | March 11, 2020, 10:43 p.m. |
| The SIGABA Challenge — Part 2 | 2,000 | March 5, 2020, 11:35 p.m. |
| The SIGABA Challenge — Part 1 | 2,000 | Feb. 29, 2020, 5:14 p.m. |
| Breaking a Filter Generator | 1,660 | Sept. 29, 2018, 1:49 p.m. |
| Double Column Transposition — Part 4 | 1,104 | Sept. 3, 2018, 8:28 p.m. |
| ElsieFour — Part 1 | 14,436 | June 18, 2018, 10:14 p.m. |
| Advent Challenge — Part 3 | 2,000 | Dec. 23, 2017, 10:37 a.m. |
| Advent Challenge — Part 4 | 2,000 | Dec. 21, 2017, 10:27 p.m. |
| Heartbleed — Part 1 | 100 | Nov. 22, 2015, 6:51 p.m. |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 1,101 | Nov. 8, 2015, 4:14 p.m. |
| RSA: Two different keys — same ciphertext | 1,105 | Nov. 7, 2015, 8:26 a.m. |
| Unusual encryption using a diophantine equation | 1,105 | Nov. 5, 2015, 8:37 p.m. |
| BCR code (Book-Caesar-RSA) | 1,114 | Nov. 5, 2015, 5:55 p.m. |
| Letter to the Templars — Part 3 | 1,115 | Oct. 29, 2015, 6:52 p.m. |
| Hybrid Encryption I | 1,100 | Oct. 29, 2015, 5:52 p.m. |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 100 | Oct. 28, 2015, 3:53 p.m. |
| AES key — encoded in the machine readable zone of a European ePassport | 1,108 | Oct. 25, 2015, 6:08 p.m. |
| Not-so-Secret Message from Malawi — Part I (RSA) | 1,100 | Oct. 25, 2015, 9:47 a.m. |
| Broadcasting and low exponent — RSA Attack | 1,105 | Oct. 24, 2015, 8:52 p.m. |
| Alice's Birthday Party (Part 2) | 1,100 | Oct. 24, 2015, 8:29 p.m. |
| Alice's Birthday Party (Part 1) | 1,100 | Oct. 24, 2015, 7:14 p.m. |
| Partial Key Exposure with RSA — Part 1 | 1,109 | Oct. 24, 2015, 6:11 p.m. |
| Typex — Part 2 | 1,121 | Oct. 11, 2015, 2:31 p.m. |
| Typex — Part 1 | 1,120 | Oct. 9, 2015, 11:37 p.m. |
| Spirale — Part 3 | 1,378 | Sept. 13, 2015, 3:43 p.m. |
| Spirale — Part 2 | 1,378 | Sept. 12, 2015, 9:15 p.m. |
| Spirale — Part 1 | 1,378 | Sept. 12, 2015, 9:12 p.m. |
| Weakened Handycipher — Part 3 | 1,444 | May 26, 2015, 8:31 a.m. |
| Sigaba Part 2 | 13,432 | April 17, 2015, 7:12 p.m. |
| Sigaba Part 1 | 1,103 | April 10, 2015, 11:18 a.m. |
| CMEA 2 | 13,451 | April 2, 2015, 2:39 p.m. |
| M-138 — Part 2 | 1,235 | March 28, 2015, 7:06 p.m. |
| Double Columnar Transposition | 100 | March 22, 2015, 9:11 p.m. |
| M-138 — Part 1 | 101 | March 22, 2015, 1:58 p.m. |
| CMEA 1 | 1,104 | March 22, 2015, 12:08 p.m. |
| One-Time Pad with Flaws | 100 | March 17, 2015, 8:31 p.m. |
| ADFGVX — Part 2 | 100 | March 11, 2015, 8:39 p.m. |
| ORYX Stream Cipher — Part 4b | 14,283 | March 10, 2015, 10:57 p.m. |
| How do you become a big cryptographer? | 100 | March 8, 2015, 9:06 a.m. |
| Recycled One-Time Pad | 100 | March 7, 2015, 4:10 p.m. |
| Playfair with hints about the grid | 100 | Feb. 28, 2015, 9:22 p.m. |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 1,104 | Feb. 28, 2015, 1:40 p.m. |
| Cracking SHA1-Hashed Passwords | 1,107 | Feb. 28, 2015, 9:05 a.m. |
| Enigma Part 2 | 1,104 | Feb. 27, 2015, 2:25 p.m. |
| ORYX Stream Cipher — Part 4a | 1,165 | Feb. 17, 2015, 7:53 p.m. |
| Enigma Messages with Repeated Letters — Part 5 | 100 | Feb. 1, 2015, 4:46 p.m. |
| Factorization Cipher — Part 2 | 1,113 | Jan. 31, 2015, 8:12 p.m. |
| Factorization Cipher — Part 1 | 100 | Jan. 29, 2015, 9:55 p.m. |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 100 | Jan. 27, 2015, 9:02 p.m. |
| Enigma Messages | 100 | Jan. 25, 2015, 10:29 p.m. |
| Enigma Messages with Repeated Letters — Part 3 | 100 | Jan. 25, 2015, 8:39 p.m. |
| Enigma Messages with Repeated Letters — Part 2 | 100 | Jan. 25, 2015, 8:34 p.m. |
| Enigma Messages with Repeated Letters — Part 4 | 100 | Jan. 25, 2015, 8:30 p.m. |
| Enigma Part 1 | 1,104 | Jan. 25, 2015, 8:09 p.m. |
| ORYX Stream Cipher — Part 3 (revised) | 1,137 | Jan. 25, 2015, 9:27 a.m. |
| ORYX Stream Cipher Part II | 1,104 | Jan. 24, 2015, 1:53 p.m. |
| Beaver Code | 100 | Jan. 23, 2015, 9:54 p.m. |
| Grille Cipher | 100 | Jan. 21, 2015, 9:14 p.m. |
| Trifid Cipher | 100 | Jan. 21, 2015, 8:23 p.m. |
| ORYX Stream Cipher Part I | 1,104 | Jan. 20, 2015, 9:32 p.m. |
| Playfair Encryption | 100 | Jan. 19, 2015, 10:47 p.m. |
| Enigma Messages with Repeated Letters — Part 1 | 100 | Jan. 17, 2015, 10:22 p.m. |
| ADFGVX — Part 1 | 100 | Jan. 17, 2015, 8:49 p.m. |
3
Gold18
Silver2
