| Number Sequence | 4228 | 100 |
| Original Caesar Cipher | 2949 | 100 |
| Number Sequence — Part 2 | 2073 | 100 |
| Caesar Encryption | 1408 | 100 |
| Beaver Code | 1161 | 100 |
| Letter to the Templars — Part 1 | 1007 | 100 |
| Number Sequence — Part 3 | 983 | 100 |
| Number Sequence — Part 4 | 811 | 100 |
| A hidden word | 810 | 100 |
| Letter to the Templars — Part 2 | 807 | 100 |
| Letter to the Templars — Part 3 | 700 | 1084 |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 575 | 100 |
| Monoalphabetic Substitution | 538 | 100 |
| Cracking SHA1-Hashed Passwords | 532 | 1080 |
| Factorization Cipher — Part 1 | 489 | 100 |
| Grille Cipher | 471 | 100 |
| Advent-Challenge — Part 1 | 430 | 100 |
| A modified homophonic cipher with reduced alphabets — Part 1 | 383 | 100 |
| Number Sequence — Part 8 | 381 | 100 |
| A modified homophonic cipher with reduced alphabets — Part 2 | 330 | 100 |
| One-Time Pad with Flaws | 302 | 100 |
| Alice's Birthday Party (Part 1) | 293 | 1080 |
| Snow White and the seven dwarfs | 284 | 100 |
| Alice's Birthday Party (Part 2) | 283 | 1080 |
| From Russia with Love | 274 | 100 |
| Broadcasting and low exponent — RSA Attack | 228 | 1081 |
| Modified Caesar Cipher | 222 | 100 |
| How do you become a big cryptographer? | 221 | 100 |
| M-138 — Part 1 | 208 | 100 |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 195 | 1080 |
| Not-so-Secret Message from Malawi — Part I (RSA) | 194 | 1080 |
| Reserve Hand Procedure — Part 1 | 188 | 100 |
| Classical Ciphers^3 | 176 | 100 |
| Letter from the Alleged Countess Julie von Ortenburg | 174 | 100 |
| Hybrid Encryption I | 174 | 1080 |
| Enigma Messages with Repeated Letters — Part 1 | 169 | 100 |
| Cryptanalysis Hacking Puzzles — Part 2 | 167 | 100 |
| Nils away on travel | 166 | 100 |
| RSA: Two different keys — same ciphertext | 153 | 1081 |
| ¿No Hablas Español? No problemo! | 153 | 100 |
| Pigpen with a twist — Part 1 | 151 | 100 |
| Number Sequence — Part 6 | 151 | 100 |
| Molehunt (Part 1/3) | 148 | 100 |
| Factorization Cipher — Part 2 | 146 | 1082 |
| The Book Code: A Challenge for Bookworms | 146 | 100 |
| Autokey Cipher | 145 | 100 |
| Molehunt (Part 2/3) | 140 | 100 |
| M-138 — Part 2 | 131 | 1090 |
| Image Noise | 131 | 100 |
| Enigma Part 1 | 129 | 1080 |
| A Secret Message from Castle Mansfeld | 124 | 100 |
| Trifid Cipher | 120 | 100 |
| ADFGVX — Part 2 | 117 | 100 |
| A really long number sequence | 115 | 1081 |
| Playfair Encryption | 112 | 100 |
| ADFGVX — Part 1 | 112 | 100 |
| Number Sequence — Part 9 | 111 | 100 |
| Double Columnar Transposition | 110 | 100 |
| Playfair with hints about the grid | 107 | 100 |
| Number Sequence — Part 10 | 107 | 100 |
| A hidden word — Part 2 | 105 | 100 |
| Kaskade-S/T — Part 1 | 101 | 100 |
| Enigma Combinatorics | 99 | 100 |
| Zodiac Cipher | 95 | 100 |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 95 | 100 |
| Number Sequence — Part 5 | 95 | 100 |
| Hill Cipher with Sudoku Key | 95 | 100 |
| Factorization Cipher — Part 3 | 94 | 1082 |
| ECDH-Key Exchange for Beginners | 92 | 100 |
| The Last Note | 91 | 100 |
| Heartbleed — Part 1 | 90 | 0 |
| Enigma Part 2 | 88 | 1080 |
| Number Sequence — Part 7 | 88 | 100 |
| Partial Key Exposure with RSA — Part 1 | 82 | 1082 |
| Molehunt (Part 3/3) | 80 | 1080 |
| Enigma Messages with Repeated Letters — Part 2 | 80 | 100 |
| Enigma Messages with Repeated Letters — Part 3 | 80 | 100 |
| ORYX Stream Cipher Part I | 79 | 1080 |
| Enigma Messages with Repeated Letters — Part 5 | 77 | 100 |
| AES key — encoded in the machine readable zone of a European ePassport | 75 | 1082 |
| Enigma Messages | 75 | 100 |
| Multilingual Monoalphabetic Substitution | 75 | 100 |
| Smartcard RSA | 74 | 1080 |
| Enigma Messages with Repeated Letters — Part 4 | 72 | 100 |
| BCR code (Book-Caesar-RSA) | 71 | 1084 |
| Turing Bombe Enigma I | 69 | 100 |
| Cascading Encryption — Part 1/3 | 68 | 100 |
| Modular Sequences | 67 | 100 |
| Wheatstone Cryptograph — Part 1 | 67 | 100 |
| Recycled One-Time Pad | 66 | 100 |
| Find the right route — Part 1 | 66 | 100 |
| Unusual encryption using a diophantine equation | 65 | 1081 |
| Monoalphabetic substitution with camouflage — Part 1 | 62 | 100 |
| Heartbleed — Part 2 | 60 | 0 |
| RSA Factoring Challenge: RSA-704 | 59 | 0 |
| The Einstein Enigma | 59 | 1104 |
| M-138 — Part 3 | 58 | 1090 |
| An Invisible Message | 57 | 100 |
| News from Castle Mansfeld | 54 | 100 |
| Summer Job | 52 | 1107 |
| Kaskade-S/T — Part 2 | 51 | 1080 |
| RSA Factoring Challenge: RSA-210 | 51 | 0 |
| Unconcealed RSA messages | 50 | 1082 |
| Monoalphabetic substitution with camouflage — Part 2 | 50 | 1082 |
| New Year's Greetings — Part 1 | 50 | 100 |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 49 | 1080 |
| Double Column Transposition — Part 4 | 49 | 1088 |
| Advent-Challenge — Part 2 | 49 | 1103 |
| ORYX Stream Cipher Part II | 47 | 1080 |
| Monoalphabetic substitution with camouflage — Part 4 | 47 | 100 |
| Keyshanc — Part 1 | 47 | 1083 |
| Monoalphabetic substitution with camouflage — Part 3 | 46 | 1082 |
| Strange Message from Thessaloniki | 46 | 100 |
| New Year's Greetings — Part 2 | 46 | 100 |
| Double Column Transposition — Part 2 | 45 | 1088 |
| Weakened Granit — Part 1 | 44 | 100 |
| New Year's Greetings — Part 3 | 44 | 100 |
| Lightweight Introduction to Lattices — Part 1 | 44 | 100 |
| Advent Challenge — Part 3 | 43 | 1104 |
| Polyhomophonic Substitution — Part 1 | 43 | 100 |
| CMEA 1 | 42 | 1080 |
| Music Code — Part 1 | 42 | 100 |
| Not-so-Secret Message from Malawi — Part II (ECC) | 41 | 1080 |
| Music Code — Part 2 | 41 | 1081 |
| An 'unhearable' message | 41 | 100 |
| New Year's Greetings — Part 4 | 41 | 100 |
| Double Column Transposition — Part 3 | 40 | 1088 |
| Advent Challenge — Part 4 | 40 | 1104 |
| Ku Klux Klan | 39 | Variable |
| Pigpen with a twist — Part 2 | 39 | 1081 |
| Pigpen with a twist — Part 3 | 39 | 1081 |
| Homophonic Encryption — Part 1 | 39 | 1115 |
| Keyshanc — Part 2 | 38 | 1083 |
| Alberti Challenge - Part 1 | 37 | 102 |
| RSA Factoring Challenge: RSA-220 | 35 | 0 |
| Fastest in the West | 34 | 1107 |
| Trendy Messenger | 34 | 1107 |
| Homophonic Encryption — Part 2 | 34 | 1115 |
| Homophonic Encryption — Part 3 | 34 | 1115 |
| Kaskade-S/T — Part 3 | 33 | 1080 |
| Heartbleed — Part 3 | 33 | 0 |
| Homophonic Encryption — Part 4 | 33 | 1115 |
| Lattice Part 1 | 32 | 1080 |
| Double Column Transposition — Part 1 | 32 | 1088 |
| Lightweight Introduction to Lattices — Part 2 | 32 | 100 |
| ORYX Stream Cipher — Part 3 (revised) | 31 | 1085 |
| Monoalphabetic Substitution with Nostradamus Flavor | 31 | 1113 |
| RSA Factoring Challenge: RSA-230 | 30 | 0 |
| Spanish Strip Cipher — Part 1 | 30 | 1088 |
| Monoalphabetic Substitution with Camouflage — Part 5 | 29 | 1082 |
| Cryptanalysis Hacking Puzzles — Part 1 | 29 | 100 |
| Lightweight Introduction to Lattices — Part 3 | 29 | 1132 |
| M-138 — Part 4 | 28 | 1090 |
| CMEA 2 | 27 | 13034 |
| Typex — Part 1 | 27 | 1085 |
| Spanish Strip Cipher — Part 2 | 27 | 1088 |
| AES ECB Wrong Encoding | 25 | 1103 |
| RSA with Special d | 24 | 13029 |
| Handycipher made in love — Part 1 | 24 | 1113 |
| Find the right route — Part 2 | 24 | 100 |
| Typex — Part 2 | 23 | 1085 |
| Polyhomophonic Substitution — Part 2 | 23 | 1127 |
| Find the right route — Part 3 | 23 | 100 |
| Polyphonic Substitution Cipher — Part 1 | 22 | 1121 |
| The LoRa Cipher: Logic Randomness — Part 1 | 22 | 1125 |
| RSA Factoring Challenge: RSA-240 | 21 | 0 |
| RSA Factoring Challenge: RSA-250 | 20 | 0 |
| Polyphonic Substitution Cipher — Part 2 | 20 | 1123 |
| RSA Factoring Challenge: RSA-232 | 19 | 0 |
| Breaking a Filter Generator | 19 | 1109 |
| The T52 Sturgeon Challenge — Part 1 | 19 | 1117 |
| Purple 1 | 18 | 1080 |
| Handycipher made in love — Part 2 | 18 | 1115 |
| The T52 Sturgeon Challenge — Part 2 | 17 | 1117 |
| Cipher ID — Part 1 | 17 | 1121 |
| Sigaba Part 1 | 16 | 1080 |
| Concealed Messages — Vigenère's Night Sky | 16 | 0 |
| Cascading Encryption — Part 2/3 | 16 | 1085 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 1 | 16 | 1096 |
| A Cloaked Substitution Cipher — Part 1 | 16 | 1118 |
| The SZ42 Challenge — Part 1 | 16 | 1132 |
| The SZ42 Challenge — Part 2 | 16 | 1133 |
| Weakened Handycipher — Part 1 | 15 | 1091 |
| Flawed Usage of a OTP Cipher by the BND | 15 | 1092 |
| New Year's Greetings — Part 5 | 15 | 1094 |
| A Cloaked Substitution Cipher — Part 2 | 15 | 1118 |
| Polyhomophonic Substitution — Part 3 | 15 | 1127 |
| Weakened Handycipher — Part 3 | 14 | 1091 |
| The T52 Sturgeon Challenge — Part 3 | 14 | 1117 |
| The SZ42 Challenge — Part 3 | 14 | 1134 |
| The SZ42 Challenge — Part 4 | 14 | 1135 |
| Weakened Handycipher — Part 2 | 13 | 1091 |
| The SZ42 Challenge — Part 5 | 13 | 1135 |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 | 12 | 1081 |
| Cascading Encryption — Part 3/3 | 12 | 1085 |
| ORYX Stream Cipher — Part 4a | 12 | 1088 |
| The T52 Sturgeon Challenge — Part 4 | 11 | 1117 |
| The SZ42 Challenge — Part 6 | 11 | 1137 |
| The SZ42 Challenge — Part 8 | 11 | 1139 |
| Akelarre Part 1 | 10 | 1080 |
| Kaskade-S/T — Part 5 | 10 | 1081 |
| The SZ42 Challenge — Part 7 | 10 | 1138 |
| The SZ42 Challenge — Part 9 | 10 | 1142 |
| Double Column Transposition — Part 5 | 9 | 1088 |
| Hilly — Part 1 | 9 | 1098 |
| The T52 Sturgeon Challenge — Part 8 | 9 | 1118 |
| The SIGABA Challenge — Part 1 | 9 | 1125 |
| Wheatstone Cryptograph — Part 2 | 9 | 1157 |
| The T52 Sturgeon Challenge — Part 11 | 8 | 1118 |
| The SIGABA Challenge — Part 2 | 8 | 1126 |
| Handycipher — Part 2 | 7 | 1091 |
| Holographic Encryption — Part 1 | 7 | 1099 |
| The T52 Sturgeon Challenge — Part 12 | 7 | 1118 |
| The SZ42 Challenge — Part 12 | 7 | 1181 |
| Modified Vigenère Cipher | 7 | 1221 |
| Handycipher — Part 3 | 6 | 13224 |
| Kaskade-S/T — Part 6 (RansomKaskade Part 1) | 6 | 1101 |
| "The Road" — Part 1 | 6 | 1111 |
| The T52 Sturgeon Challenge — Part 9 | 6 | 1118 |
| The T52 Sturgeon Challenge — Part 5 | 6 | 1118 |
| The T52 Sturgeon Challenge — Part 6 | 6 | 1118 |
| The T52 Sturgeon Challenge — Part 7 | 6 | 1118 |
| The SIGABA Challenge — Part 3 | 6 | 13786 |
| The SZ42 Challenge — Part 13 | 6 | 1181 |
| Sigaba Part 2 | 5 | 13029 |
| Handycipher — Part 1 | 5 | 1091 |
| Spirale — Part 1 | 5 | 1092 |
| Spirale — Part 2 | 5 | 1092 |
| Handycipher — Part 5 | 5 | 13311 |
| Handycipher — Part 6 | 5 | 13311 |
| Weakened Handycipher — Part 4 | 5 | 1096 |
| Weakened Handycipher — Part 5 | 5 | 1096 |
| Weakened Handycipher — Part 6 | 5 | 1096 |
| Weakened ElsieFour — Part 1 | 5 | 1106 |
| The T52 Sturgeon Challenge — Part 10 | 5 | 1118 |
| The SIGABA Challenge — Part 4 | 5 | 13790 |
| Notes of an Italian Soldier | 4 | 0 |
| Spirale — Part 3 | 4 | 1092 |
| Handycipher — Part 4 | 4 | 13311 |
| ElsieFour — Part 1 | 4 | 13420 |
| Weakened ElsieFour — Part 3 | 4 | 1102 |
| The Heavy T52 Sturgeon Challenge — Part 4 | 4 | 13809 |
| The Heavy T52 Sturgeon Challenge — Part 7 | 4 | 13815 |
| The SZ42 Challenge — Part 10 | 4 | 1146 |
| The SZ42 Challenge — Part 11 | 4 | 1146 |
| Extended Handycipher — Part 1 | 3 | 1091 |
| Extended Handycipher — Part 2 | 3 | 1091 |
| Extended Handycipher — Part 3 | 3 | 1091 |
| Extended Handycipher — Part 4 | 3 | 13311 |
| Extended Handycipher — Part 5 | 3 | 13311 |
| Handycipher — Part 8 | 3 | 13356 |
| Handycipher — Part 9 | 3 | 13356 |
| Holographic Encryption — Part 2 | 3 | 1099 |
| The Vatican Challenge — Part 1 | 3 | 0 |
| The Vatican Challenge — Part 2 | 3 | 0 |
| Christmas Challenge 2019: Differential Cryptanalysis — Part 1 | 3 | 1123 |
| Differential Cryptanalysis — Part 2 | 3 | 1124 |
| The Heavy T52 Sturgeon Challenge — Part 5 | 3 | 13813 |
| Double Column Transposition | 2 | 0 |
| Unknown Author | 2 | Variable |
| ORYX Stream Cipher — Part 4b | 2 | 13175 |
| Extended Handycipher — Part 6 | 2 | 13311 |
| Handycipher — Part 7 | 2 | 13356 |
| Catherine of Aragon's Letter to King Ferdinand, her Father (1509) | 2 | Variable |
| The Heavy T52 Sturgeon Challenge — Part 2 | 2 | 13695 |
| The Heavy T52 Sturgeon Challenge — Part 3 | 2 | 13704 |
| The SIGABA Challenge — Part 5 | 2 | 13795 |
| The Heavy T52 Sturgeon Challenge — Part 6 | 2 | 13814 |
| The Heavy T52 Sturgeon Challenge — Part 9 | 2 | 13819 |
| SIGABA CSP-889 — Part 1 | 2 | 1159 |
| SIGABA CSP-889 — Part 2 | 2 | 1159 |
| SIGABA CSP-889 — Part 3 | 2 | 14244 |
| SIGABA CSP-2900 — Part 1 | 2 | 1168 |
| SIGABA CSP-2900 — Part 2 | 2 | 1168 |
| SIGABA CSP-2900 — Part 3 | 2 | 14359 |
| Beale Ciphers | 1 | Variable |
| Substitution Cipher with Non-Prefix Codes | 1 | 13052 |
| Monoalphabetic Substitution with Camouflage — Part 6 | 1 | 1083 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 2 | 1 | 1096 |
| Hilly — Part 2 | 1 | 1102 |
| Weakened ElsieFour — Part 2 | 1 | 1106 |
| Handycipher — Part 10 | 1 | 1116 |
| The Vatican Challenge — Part 4 | 1 | Variable |
| The Heavy T52 Sturgeon Challenge — Part 1 | 1 | 13690 |
| The SIGABA Challenge — Part 6 | 1 | 13802 |
| D'Agapeyeff | 0 | Variable |
| Dorabella | 0 | Variable |
| Kryptos | 0 | Variable |
| World Record Challenge: Break 65 Bits of AES | 0 | 13029 |
| Recovering the Private Key in the Fully Homomorphic Encryption Scheme | 0 | 13037 |
| Twelve-Year-Old Murder Case | 0 | Variable |
| Kaskade-S/T — Part 4 | 0 | 1081 |
| Digital Signatures: DSA with Medium Fields | 0 | 13060 |
| The third ENIGMA M4 message | 0 | Variable |
| RSA Factoring Challenge: RSA-260 | 0 | 13077 |
| RSA Factoring Challenge: RSA-270 | 0 | 13077 |
| RSA Factoring Challenge: RSA-896 | 0 | 13077 |
| RSA Factoring Challenge: RSA-280 | 0 | 13077 |
| RSA Factoring Challenge: RSA-290 | 0 | 13077 |
| RSA Factoring Challenge: RSA-300 | 0 | 13077 |
| RSA Factoring Challenge: RSA-309 | 0 | 13077 |
| RSA Factoring Challenge: RSA-1024 | 0 | 13077 |
| RSA Factoring Challenge: RSA-310 | 0 | 13077 |
| RSA Factoring Challenge: RSA-320 | 0 | 13077 |
| RSA Factoring Challenge: RSA-330 | 0 | 13077 |
| RSA Factoring Challenge: RSA-340 | 0 | 13077 |
| RSA Factoring Challenge: RSA-350 | 0 | 13077 |
| RSA Factoring Challenge: RSA-360 | 0 | 13077 |
| RSA Factoring Challenge: RSA-370 | 0 | 13077 |
| RSA Factoring Challenge: RSA-380 | 0 | 13077 |
| RSA Factoring Challenge: RSA-390 | 0 | 13077 |
| RSA Factoring Challenge: RSA-400 | 0 | 13077 |
| RSA Factoring Challenge: RSA-410 | 0 | 13077 |
| RSA Factoring Challenge: RSA-420 | 0 | 13077 |
| RSA Factoring Challenge: RSA-430 | 0 | 13077 |
| RSA Factoring Challenge: RSA-440 | 0 | 13077 |
| RSA Factoring Challenge: RSA-450 | 0 | 13077 |
| RSA Factoring Challenge: RSA-460 | 0 | 13077 |
| RSA Factoring Challenge: RSA-1536 | 0 | 13077 |
| RSA Factoring Challenge: RSA-470 | 0 | 13077 |
| RSA Factoring Challenge: RSA-480 | 0 | 13077 |
| RSA Factoring Challenge: RSA-490 | 0 | 13077 |
| RSA Factoring Challenge: RSA-500 | 0 | 13077 |
| RSA Factoring Challenge: RSA-617 | 0 | 13077 |
| RSA Factoring Challenge: RSA-2048 | 0 | 13077 |
| ORYX Stream Cipher — Part 4d | 0 | 13136 |
| Double Column Transposition Reloaded — Part 1 | 0 | 13158 |
| Double Column Transposition Reloaded — Part 2 | 0 | 13158 |
| Double Column Transposition Reloaded — Part 3 | 0 | 13158 |
| Spanish Strip Cipher — Part 3 | 0 | Variable |
| ORYX Stream Cipher — Part 4c | 0 | 13175 |
| Double-Column Transposition/Granit — Part 1 | 0 | 1092 |
| Double-Column Transposition/Granit — Part 2 | 0 | 1092 |
| Double-Column Transposition/Granit — Part 3 | 0 | 1092 |
| Spirale — Part 4 | 0 | 13253 |
| Weakened Granit — Part 2 | 0 | 1093 |
| Weakened Granit — Part 3 | 0 | 1093 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 3 | 0 | 1096 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 4 | 0 | 1096 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 5 | 0 | 1096 |
| "The Road" — Part 2 | 0 | 1111 |
| "The Road" — Part 3 | 0 | 1111 |
| The Vatican Challenge — Part 3 | 0 | Variable |
| The Vatican Challenge — Part 5 | 0 | Variable |
| The Heavy T52 Sturgeon Challenge — Part 8 | 0 | 13815 |
| Alberti Challenge - Part 2 | 0 | 1576 |
