| Date | User | Challenge | Score |
| akkult | Favourite byte | 20 | |
| hanging_tree_213 | Finding Flags | 2 | |
| N01r | XOR Properties | 15 | |
| nihhajawarembang | ECB Oracle | 60 | |
| ANYi | You either know, XOR you don't | 30 | |
| Beethoven3 | Lazy CBC | 60 | |
| Aryaethn | Noise Free | 40 | |
| rphitheta | Encoding Challenge | 40 | |
| r34770c | Modular Arithmetic 1 | 20 | |
| Beethoven3 | Transparency | 50 | |
| yololmao | Special Soundness | 25 | |
| akkult | XOR Properties | 15 | |
| Beethoven3 | SSH Keys | 35 | |
| nihhajawarembang | ECB CBC WTF | 55 | |
| ANYi | Favourite byte | 20 | |
| Beethoven3 | CERTainly not | 30 | |
| N01r | XOR Starter | 10 | |
| r34770c | Extended GCD | 20 | |
| ANYi | XOR Properties | 15 | |
| ShreyaTrivedi | Resisting Bruteforce | 10 | |
| ShreyaTrivedi | Keyed Permutations | 5 | |
| dimi3 | RSA Decryption | 20 | |
| dimi3 | Private Keys | 20 | |
| mr265 | Modular Square Root | 35 | |
| dimi3 | Euler's Totient | 20 | |
| dimi3 | Public Keys | 15 | |
| dimi3 | Modular Exponentiation | 10 | |
| ANYi | XOR Starter | 10 | |
| Beethoven3 | Privacy-Enhanced Mail? | 25 | |
| zhifeiji | Great Snakes | 3 | |
| LoftyCheese | Modular Inverting | 25 | |
| LoftyCheese | Modular Arithmetic 2 | 20 | |
| halliana | Dancing Queen | 120 | |
| WerewolfVT | Hex | 5 | |
| WerewolfVT | ASCII | 5 | |
| Beethoven3 | Lemur XOR | 40 | |
| kaiserx | Smooth Criminal | 60 | |
| prt_tm_phlsphr | XOR Starter | 10 | |
| engman | Salty | 20 | |
| WerewolfVT | Great Snakes | 3 | |
| ezhpry | Greatest Common Divisor | 15 | |
| zhifeiji | Finding Flags | 2 | |
| CarloTran | You either know, XOR you don't | 30 | |
| F0rhex | ECB Oracle | 60 | |
| toad | Backpack Cryptography | 120 | |
| ANYi | Encoding Challenge | 40 | |
| sleepink | Resisting Bruteforce | 10 | |
| kieugiathinhphat | Cofactor Cofantasy | 150 | |
| sleepink | Keyed Permutations | 5 | |
| ezhpry | You either know, XOR you don't | 30 |
You are now level Current level