| Date | User | Challenge | Score |
| saviurzz | ASCII | 5 | |
| HackerJohn | Base64 | 10 | |
| chinmoy_paul | Beatboxer | 150 | |
| saviurzz | Great Snakes | 3 | |
| Laniakea24 | Bean Counter | 60 | |
| Slimikz | CERTainly not | 30 | |
| chrischako | XOR Properties | 15 | |
| ysjy | Favourite byte | 20 | |
| SleunamC | Extended GCD | 20 | |
| Slimikz | Privacy-Enhanced Mail? | 25 | |
| Unifl0s | Favourite byte | 20 | |
| chrischako | XOR Starter | 10 | |
| ADDADDA | Privacy-Enhanced Mail? | 25 | |
| ysjy | XOR Properties | 15 | |
| saviurzz | Finding Flags | 2 | |
| HackerJohn | Hex | 5 | |
| Slimikz | Encoding Challenge | 40 | |
| HackerJohn | ASCII | 5 | |
| Laniakea24 | Symmetry | 50 | |
| knutt | Bytes and Big Integers | 10 | |
| HackerJohn | Great Snakes | 3 | |
| chrischako | Bytes and Big Integers | 10 | |
| hunhaki | Base64 | 10 | |
| ysjy | XOR Starter | 10 | |
| Slimikz | Lemur XOR | 40 | |
| againlame | Round Keys | 20 | |
| againlame | Structure of AES | 15 | |
| againlame | Resisting Bruteforce | 10 | |
| againlame | Keyed Permutations | 5 | |
| parkjaemin | Confusion through Substitution | 25 | |
| HackerJohn | Finding Flags | 2 | |
| AndreasK | ASCII | 5 | |
| parkjaemin | Round Keys | 20 | |
| parkjaemin | Structure of AES | 15 | |
| Slimikz | Network Attacks | 5 | |
| parkjaemin | Resisting Bruteforce | 10 | |
| ungjae | Flipping Cookie | 60 | |
| evarist | Curveball | 100 | |
| chinmoy_paul | Efficient Exchange | 50 | |
| chinmoy_paul | Curves and Logs | 40 | |
| chinmoy_paul | Scalar Multiplication | 35 | |
| AndreasK | Great Snakes | 3 | |
| knutt | Base64 | 10 | |
| KevinMortensen | ASCII | 5 | |
| Busk | ASCII | 5 | |
| Fezmoh | Finding Flags | 2 | |
| ozzy | XOR Starter | 10 | |
| Sofa | ASCII | 5 | |
| knutt | Hex | 5 | |
| camo132108 | ECB CBC WTF | 55 |
You are now level Current level