| Number Sequence | 4197 | 100 |
| Original Caesar Cipher | 2916 | 100 |
| Number Sequence — Part 2 | 2056 | 100 |
| Caesar Encryption | 1390 | 100 |
| Beaver Code | 1153 | 100 |
| Letter to the Templars — Part 1 | 999 | 100 |
| Number Sequence — Part 3 | 968 | 100 |
| Number Sequence — Part 4 | 800 | 100 |
| Letter to the Templars — Part 2 | 799 | 100 |
| A hidden word | 795 | 100 |
| Letter to the Templars — Part 3 | 695 | 1084 |
| Affine Codes / Modulo Arithmetic with N / Extended Euclid | 563 | 100 |
| Monoalphabetic Substitution | 532 | 100 |
| Cracking SHA1-Hashed Passwords | 522 | 1081 |
| Factorization Cipher — Part 1 | 485 | 100 |
| Grille Cipher | 468 | 100 |
| Advent-Challenge — Part 1 | 412 | 100 |
| A modified homophonic cipher with reduced alphabets — Part 1 | 380 | 100 |
| Number Sequence — Part 8 | 369 | 100 |
| A modified homophonic cipher with reduced alphabets — Part 2 | 327 | 100 |
| One-Time Pad with Flaws | 300 | 100 |
| Alice's Birthday Party (Part 1) | 286 | 1080 |
| Alice's Birthday Party (Part 2) | 280 | 1080 |
| Snow White and the seven dwarfs | 280 | 100 |
| From Russia with Love | 269 | 100 |
| Broadcasting and low exponent — RSA Attack | 225 | 1082 |
| How do you become a big cryptographer? | 219 | 100 |
| Modified Caesar Cipher | 218 | 100 |
| M-138 — Part 1 | 202 | 100 |
| Brute-Force-Attack on Triple-DES with Reduced Key Space | 192 | 1080 |
| Not-so-Secret Message from Malawi — Part I (RSA) | 189 | 1080 |
| Reserve Hand Procedure — Part 1 | 187 | 100 |
| Letter from the Alleged Countess Julie von Ortenburg | 172 | 100 |
| Hybrid Encryption I | 171 | 1080 |
| Classical Ciphers^3 | 170 | 100 |
| Enigma Messages with Repeated Letters — Part 1 | 167 | 100 |
| Nils away on travel | 161 | 100 |
| Cryptanalysis Hacking Puzzles — Part 2 | 159 | 100 |
| RSA: Two different keys — same ciphertext | 151 | 1082 |
| Pigpen with a twist — Part 1 | 149 | 100 |
| Molehunt (Part 1/3) | 147 | 100 |
| ¿No Hablas Español? No problemo! | 147 | 100 |
| Number Sequence — Part 6 | 147 | 100 |
| Factorization Cipher — Part 2 | 144 | 1082 |
| The Book Code: A Challenge for Bookworms | 141 | 100 |
| Molehunt (Part 2/3) | 139 | 100 |
| Autokey Cipher | 139 | 100 |
| Enigma Part 1 | 129 | 1080 |
| M-138 — Part 2 | 126 | 1091 |
| Image Noise | 124 | 100 |
| A Secret Message from Castle Mansfeld | 123 | 100 |
| Trifid Cipher | 117 | 100 |
| ADFGVX — Part 2 | 114 | 100 |
| A really long number sequence | 113 | 1082 |
| Playfair Encryption | 108 | 100 |
| ADFGVX — Part 1 | 108 | 100 |
| Double Columnar Transposition | 108 | 100 |
| Number Sequence — Part 9 | 107 | 100 |
| Playfair with hints about the grid | 105 | 100 |
| Number Sequence — Part 10 | 103 | 100 |
| Kaskade-S/T — Part 1 | 101 | 100 |
| A hidden word — Part 2 | 100 | 100 |
| Enigma Combinatorics | 97 | 100 |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 | 95 | 100 |
| Zodiac Cipher | 93 | 100 |
| Number Sequence — Part 5 | 91 | 100 |
| Factorization Cipher — Part 3 | 90 | 1083 |
| ECDH-Key Exchange for Beginners | 90 | 100 |
| Hill Cipher with Sudoku Key | 90 | 100 |
| Heartbleed — Part 1 | 90 | 100 |
| The Last Note | 87 | 100 |
| Enigma Part 2 | 86 | 1080 |
| Number Sequence — Part 7 | 85 | 100 |
| Partial Key Exposure with RSA — Part 1 | 81 | 1083 |
| Molehunt (Part 3/3) | 80 | 1080 |
| ORYX Stream Cipher Part I | 78 | 1080 |
| Enigma Messages with Repeated Letters — Part 2 | 77 | 100 |
| Enigma Messages with Repeated Letters — Part 3 | 77 | 100 |
| AES key — encoded in the machine readable zone of a European ePassport | 74 | 1083 |
| Enigma Messages | 74 | 100 |
| Multilingual Monoalphabetic Substitution | 74 | 100 |
| Enigma Messages with Repeated Letters — Part 5 | 74 | 100 |
| Smartcard RSA | 70 | 1080 |
| BCR code (Book-Caesar-RSA) | 69 | 1084 |
| Enigma Messages with Repeated Letters — Part 4 | 69 | 100 |
| Turing Bombe Enigma I | 68 | 100 |
| Cascading Encryption — Part 1/3 | 67 | 100 |
| Unusual encryption using a diophantine equation | 63 | 1082 |
| Recycled One-Time Pad | 63 | 100 |
| Modular Sequences | 61 | 100 |
| Monoalphabetic substitution with camouflage — Part 1 | 60 | 100 |
| Heartbleed — Part 2 | 60 | 100 |
| Find the right route — Part 1 | 60 | 100 |
| RSA Factoring Challenge: RSA-704 | 57 | 0 |
| An Invisible Message | 56 | 100 |
| M-138 — Part 3 | 56 | 1091 |
| The Einstein Enigma | 56 | 1107 |
| Wheatstone Cryptograph — Part 1 | 55 | 100 |
| News from Castle Mansfeld | 53 | 100 |
| Kaskade-S/T — Part 2 | 50 | 1081 |
| Unconcealed RSA messages | 49 | 1082 |
| Monoalphabetic substitution with camouflage — Part 2 | 49 | 1083 |
| Summer Job | 49 | 1109 |
| RSA Factoring Challenge: RSA-210 | 48 | 0 |
| ORYX Stream Cipher Part II | 47 | 1080 |
| Lunchtime Attack on the Fully Homomorphic Encryption Scheme | 47 | 1081 |
| New Year's Greetings — Part 1 | 47 | 100 |
| Monoalphabetic substitution with camouflage — Part 4 | 46 | 100 |
| Strange Message from Thessaloniki | 46 | 100 |
| Monoalphabetic substitution with camouflage — Part 3 | 45 | 1083 |
| Keyshanc — Part 1 | 45 | 1084 |
| Advent-Challenge — Part 2 | 45 | 1106 |
| Double Column Transposition — Part 4 | 44 | 1089 |
| Weakened Granit — Part 1 | 43 | 100 |
| New Year's Greetings — Part 2 | 43 | 100 |
| CMEA 1 | 41 | 1080 |
| Music Code — Part 1 | 41 | 100 |
| Double Column Transposition — Part 2 | 41 | 1089 |
| New Year's Greetings — Part 3 | 41 | 100 |
| Lightweight Introduction to Lattices — Part 1 | 41 | 100 |
| Music Code — Part 2 | 40 | 1081 |
| An 'unhearable' message | 40 | 100 |
| Advent Challenge — Part 3 | 39 | 1106 |
| Not-so-Secret Message from Malawi — Part II (ECC) | 38 | 1080 |
| Ku Klux Klan | 38 | Variable |
| Pigpen with a twist — Part 2 | 38 | 1082 |
| New Year's Greetings — Part 4 | 38 | 100 |
| Pigpen with a twist — Part 3 | 37 | 1082 |
| Double Column Transposition — Part 3 | 37 | 1089 |
| Advent Challenge — Part 4 | 37 | 1106 |
| Homophonic Encryption — Part 1 | 37 | 1118 |
| Keyshanc — Part 2 | 36 | 1084 |
| Polyhomophonic Substitution — Part 1 | 36 | 100 |
| Kaskade-S/T — Part 3 | 33 | 1081 |
| Heartbleed — Part 3 | 33 | 1090 |
| Trendy Messenger | 33 | 1109 |
| Fastest in the West | 32 | 1109 |
| Homophonic Encryption — Part 2 | 32 | 1119 |
| Lattice Part 1 | 31 | 1081 |
| RSA Factoring Challenge: RSA-220 | 31 | 0 |
| Homophonic Encryption — Part 3 | 31 | 1119 |
| ORYX Stream Cipher — Part 3 (revised) | 30 | 1086 |
| Monoalphabetic Substitution with Nostradamus Flavor | 30 | 1116 |
| Homophonic Encryption — Part 4 | 30 | 1119 |
| Spanish Strip Cipher — Part 1 | 29 | 1089 |
| Double Column Transposition — Part 1 | 29 | 1089 |
| Lightweight Introduction to Lattices — Part 2 | 29 | 100 |
| RSA Factoring Challenge: RSA-230 | 28 | 0 |
| Monoalphabetic Substitution with Camouflage — Part 5 | 28 | 1083 |
| CMEA 2 | 27 | 13045 |
| Cryptanalysis Hacking Puzzles — Part 1 | 27 | 100 |
| Spanish Strip Cipher — Part 2 | 26 | 1089 |
| Lightweight Introduction to Lattices — Part 3 | 26 | 1139 |
| Typex — Part 1 | 25 | 1085 |
| M-138 — Part 4 | 25 | 1091 |
| RSA with Special d | 23 | 13040 |
| Handycipher made in love — Part 1 | 23 | 1116 |
| Find the right route — Part 2 | 23 | 100 |
| Typex — Part 2 | 22 | 1086 |
| AES ECB Wrong Encoding | 22 | 1106 |
| The LoRa Cipher: Logic Randomness — Part 1 | 22 | 1130 |
| Polyphonic Substitution Cipher — Part 1 | 20 | 1126 |
| Polyhomophonic Substitution — Part 2 | 20 | 1133 |
| Find the right route — Part 3 | 20 | 100 |
| Breaking a Filter Generator | 19 | 1112 |
| Purple 1 | 18 | 1080 |
| RSA Factoring Challenge: RSA-240 | 17 | 0 |
| Handycipher made in love — Part 2 | 17 | 1119 |
| The T52 Sturgeon Challenge — Part 1 | 17 | 1121 |
| Polyphonic Substitution Cipher — Part 2 | 17 | 1129 |
| Sigaba Part 1 | 16 | 1080 |
| RSA Factoring Challenge: RSA-250 | 16 | 0 |
| Concealed Messages — Vigenère's Night Sky | 16 | 0 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 1 | 16 | 1097 |
| RSA Factoring Challenge: RSA-232 | 15 | 0 |
| Cascading Encryption — Part 2/3 | 15 | 1086 |
| Weakened Handycipher — Part 1 | 15 | 1092 |
| Flawed Usage of a OTP Cipher by the BND | 15 | 1093 |
| New Year's Greetings — Part 5 | 15 | 1096 |
| The T52 Sturgeon Challenge — Part 2 | 15 | 1121 |
| A Cloaked Substitution Cipher — Part 1 | 15 | 1122 |
| Cipher ID — Part 1 | 15 | 1126 |
| Weakened Handycipher — Part 3 | 14 | 1092 |
| A Cloaked Substitution Cipher — Part 2 | 14 | 1122 |
| Polyhomophonic Substitution — Part 3 | 14 | 1133 |
| Weakened Handycipher — Part 2 | 13 | 1092 |
| The T52 Sturgeon Challenge — Part 3 | 13 | 1121 |
| Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 | 12 | 1081 |
| Cascading Encryption — Part 3/3 | 12 | 1086 |
| ORYX Stream Cipher — Part 4a | 11 | 1089 |
| The SZ42 Challenge — Part 1 | 11 | 1140 |
| The SZ42 Challenge — Part 2 | 11 | 1141 |
| Akelarre Part 1 | 10 | 1080 |
| Kaskade-S/T — Part 5 | 10 | 1081 |
| The T52 Sturgeon Challenge — Part 4 | 10 | 1121 |
| Hilly — Part 1 | 9 | 1100 |
| The SIGABA Challenge — Part 1 | 9 | 1131 |
| The SZ42 Challenge — Part 4 | 9 | 1143 |
| Double Column Transposition — Part 5 | 8 | 1089 |
| The T52 Sturgeon Challenge — Part 8 | 8 | 1122 |
| The SIGABA Challenge — Part 2 | 8 | 1131 |
| The SZ42 Challenge — Part 3 | 8 | 1142 |
| The SZ42 Challenge — Part 5 | 8 | 1143 |
| Wheatstone Cryptograph — Part 2 | 8 | 1176 |
| Handycipher — Part 2 | 7 | 1092 |
| The T52 Sturgeon Challenge — Part 11 | 7 | 1122 |
| The T52 Sturgeon Challenge — Part 12 | 7 | 1122 |
| The SZ42 Challenge — Part 6 | 7 | 1146 |
| The SZ42 Challenge — Part 8 | 7 | 1148 |
| Handycipher — Part 3 | 6 | 13243 |
| Holographic Encryption — Part 1 | 6 | 1101 |
| Kaskade-S/T — Part 6 (RansomKaskade Part 1) | 6 | 1103 |
| The T52 Sturgeon Challenge — Part 9 | 6 | 1122 |
| The T52 Sturgeon Challenge — Part 5 | 6 | 1122 |
| The T52 Sturgeon Challenge — Part 6 | 6 | 1122 |
| The T52 Sturgeon Challenge — Part 7 | 6 | 1122 |
| The SIGABA Challenge — Part 3 | 6 | 13870 |
| The SZ42 Challenge — Part 7 | 6 | 1148 |
| The SZ42 Challenge — Part 9 | 6 | 1153 |
| Sigaba Part 2 | 5 | 13040 |
| Handycipher — Part 1 | 5 | 1092 |
| Spirale — Part 1 | 5 | 1093 |
| Spirale — Part 2 | 5 | 1093 |
| Handycipher — Part 5 | 5 | 13336 |
| Handycipher — Part 6 | 5 | 13336 |
| Weakened Handycipher — Part 4 | 5 | 1097 |
| Weakened Handycipher — Part 5 | 5 | 1097 |
| Weakened Handycipher — Part 6 | 5 | 1097 |
| Weakened ElsieFour — Part 1 | 5 | 1108 |
| "The Road" — Part 1 | 5 | 1114 |
| The T52 Sturgeon Challenge — Part 10 | 5 | 1122 |
| The SIGABA Challenge — Part 4 | 5 | 13875 |
| The SZ42 Challenge — Part 12 | 5 | 1225 |
| Notes of an Italian Soldier | 4 | 0 |
| Spirale — Part 3 | 4 | 1093 |
| Handycipher — Part 4 | 4 | 13336 |
| ElsieFour — Part 1 | 4 | 13453 |
| Weakened ElsieFour — Part 3 | 4 | 1104 |
| The Heavy T52 Sturgeon Challenge — Part 4 | 4 | 13897 |
| The Heavy T52 Sturgeon Challenge — Part 7 | 4 | 13904 |
| The SZ42 Challenge — Part 13 | 4 | 1225 |
| Extended Handycipher — Part 1 | 3 | 1092 |
| Extended Handycipher — Part 2 | 3 | 1092 |
| Extended Handycipher — Part 3 | 3 | 1092 |
| Extended Handycipher — Part 4 | 3 | 13336 |
| Extended Handycipher — Part 5 | 3 | 13336 |
| Handycipher — Part 8 | 3 | 13384 |
| Handycipher — Part 9 | 3 | 13384 |
| Holographic Encryption — Part 2 | 3 | 1101 |
| The Vatican Challenge — Part 1 | 3 | 0 |
| The Vatican Challenge — Part 2 | 3 | 0 |
| Christmas Challenge 2019: Differential Cryptanalysis — Part 1 | 3 | 1128 |
| Differential Cryptanalysis — Part 2 | 3 | 1129 |
| The Heavy T52 Sturgeon Challenge — Part 5 | 3 | 13903 |
| The SZ42 Challenge — Part 10 | 3 | 1158 |
| The SZ42 Challenge — Part 11 | 3 | 1158 |
| Double Column Transposition | 2 | 0 |
| Unknown Author | 2 | Variable |
| ORYX Stream Cipher — Part 4b | 2 | 13192 |
| Extended Handycipher — Part 6 | 2 | 13336 |
| Handycipher — Part 7 | 2 | 13384 |
| Catherine of Aragon's Letter to King Ferdinand, her Father (1509) | 2 | Variable |
| The Heavy T52 Sturgeon Challenge — Part 2 | 2 | 13762 |
| The Heavy T52 Sturgeon Challenge — Part 3 | 2 | 13773 |
| The SIGABA Challenge — Part 5 | 2 | 13881 |
| The Heavy T52 Sturgeon Challenge — Part 6 | 2 | 13903 |
| The Heavy T52 Sturgeon Challenge — Part 9 | 2 | 13910 |
| SIGABA CSP-889 — Part 1 | 2 | 1179 |
| SIGABA CSP-889 — Part 2 | 2 | 1179 |
| SIGABA CSP-889 — Part 3 | 2 | 14496 |
| SIGABA CSP-2900 — Part 1 | 2 | 1195 |
| SIGABA CSP-2900 — Part 2 | 2 | 1195 |
| SIGABA CSP-2900 — Part 3 | 2 | 14696 |
| Beale Ciphers | 1 | Variable |
| Substitution Cipher with Non-Prefix Codes | 1 | 13064 |
| Monoalphabetic Substitution with Camouflage — Part 6 | 1 | 1084 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 2 | 1 | 1097 |
| Hilly — Part 2 | 1 | 1105 |
| Weakened ElsieFour — Part 2 | 1 | 1108 |
| Handycipher — Part 10 | 1 | 1120 |
| The Vatican Challenge — Part 4 | 1 | Variable |
| The Heavy T52 Sturgeon Challenge — Part 1 | 1 | 13757 |
| The SIGABA Challenge — Part 6 | 1 | 13890 |
| D'Agapeyeff | 0 | Variable |
| Dorabella | 0 | Variable |
| Kryptos | 0 | Variable |
| World Record Challenge: Break 65 Bits of AES | 0 | 13040 |
| Recovering the Private Key in the Fully Homomorphic Encryption Scheme | 0 | 13049 |
| Twelve-Year-Old Murder Case | 0 | Variable |
| Kaskade-S/T — Part 4 | 0 | 1081 |
| Digital Signatures: DSA with Medium Fields | 0 | 13072 |
| The third ENIGMA M4 message | 0 | Variable |
| RSA Factoring Challenge: RSA-260 | 0 | 13090 |
| RSA Factoring Challenge: RSA-270 | 0 | 13090 |
| RSA Factoring Challenge: RSA-896 | 0 | 13090 |
| RSA Factoring Challenge: RSA-280 | 0 | 13090 |
| RSA Factoring Challenge: RSA-290 | 0 | 13090 |
| RSA Factoring Challenge: RSA-300 | 0 | 13090 |
| RSA Factoring Challenge: RSA-309 | 0 | 13090 |
| RSA Factoring Challenge: RSA-1024 | 0 | 13090 |
| RSA Factoring Challenge: RSA-310 | 0 | 13090 |
| RSA Factoring Challenge: RSA-320 | 0 | 13090 |
| RSA Factoring Challenge: RSA-330 | 0 | 13090 |
| RSA Factoring Challenge: RSA-340 | 0 | 13090 |
| RSA Factoring Challenge: RSA-350 | 0 | 13090 |
| RSA Factoring Challenge: RSA-360 | 0 | 13090 |
| RSA Factoring Challenge: RSA-370 | 0 | 13090 |
| RSA Factoring Challenge: RSA-380 | 0 | 13090 |
| RSA Factoring Challenge: RSA-390 | 0 | 13090 |
| RSA Factoring Challenge: RSA-400 | 0 | 13090 |
| RSA Factoring Challenge: RSA-410 | 0 | 13090 |
| RSA Factoring Challenge: RSA-420 | 0 | 13090 |
| RSA Factoring Challenge: RSA-430 | 0 | 13090 |
| RSA Factoring Challenge: RSA-440 | 0 | 13090 |
| RSA Factoring Challenge: RSA-450 | 0 | 13090 |
| RSA Factoring Challenge: RSA-460 | 0 | 13090 |
| RSA Factoring Challenge: RSA-1536 | 0 | 13090 |
| RSA Factoring Challenge: RSA-470 | 0 | 13090 |
| RSA Factoring Challenge: RSA-480 | 0 | 13090 |
| RSA Factoring Challenge: RSA-490 | 0 | 13090 |
| RSA Factoring Challenge: RSA-500 | 0 | 13090 |
| RSA Factoring Challenge: RSA-617 | 0 | 13090 |
| RSA Factoring Challenge: RSA-2048 | 0 | 13090 |
| ORYX Stream Cipher — Part 4d | 0 | 13151 |
| Double Column Transposition Reloaded — Part 1 | 0 | 13174 |
| Double Column Transposition Reloaded — Part 2 | 0 | 13174 |
| Double Column Transposition Reloaded — Part 3 | 0 | 13174 |
| Spanish Strip Cipher — Part 3 | 0 | Variable |
| ORYX Stream Cipher — Part 4c | 0 | 13192 |
| Double-Column Transposition/Granit — Part 1 | 0 | 1093 |
| Double-Column Transposition/Granit — Part 2 | 0 | 1093 |
| Double-Column Transposition/Granit — Part 3 | 0 | 1093 |
| Spirale — Part 4 | 0 | 13274 |
| Weakened Granit — Part 2 | 0 | 1094 |
| Weakened Granit — Part 3 | 0 | 1094 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 3 | 0 | 1097 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 4 | 0 | 1097 |
| ASAC — A Strong(er) ADFGVX Cipher — Part 5 | 0 | 1097 |
| "The Road" — Part 2 | 0 | 1114 |
| "The Road" — Part 3 | 0 | 1114 |
| The Vatican Challenge — Part 3 | 0 | Variable |
| The Vatican Challenge — Part 5 | 0 | Variable |
| The Heavy T52 Sturgeon Challenge — Part 8 | 0 | 13906 |
