| Date | User | Challenge | Score |
| berill | Base64 | 10 | |
| Raxyz | Base64 | 10 | |
| vizz | Transparency | 50 | |
| vizz | SSH Keys | 35 | |
| Raxyz | Hex | 5 | |
| snow_bd | ASCII | 5 | |
| Raxyz | ASCII | 5 | |
| snow_bd | Great Snakes | 3 | |
| snow_bd | Finding Flags | 2 | |
| berill | Hex | 5 | |
| berill | ASCII | 5 | |
| Raxyz | Great Snakes | 3 | |
| berill | Great Snakes | 3 | |
| Raxyz | Finding Flags | 2 | |
| berill | Finding Flags | 2 | |
| CastorJr | Flipping Cookie | 60 | |
| azhariafitria | Network Attacks | 5 | |
| LLC | Modular Square Root | 35 | |
| jkkwan27 | Inferius Prime | 30 | |
| quangntenemy | Bit by Bit | 100 | |
| waniham | Great Snakes | 3 | |
| waniham | Finding Flags | 2 | |
| jkkwan27 | Salty | 20 | |
| vizz | CERTainly not | 30 | |
| Emma2266 | Modular Arithmetic 2 | 20 | |
| jkkwan27 | Factoring | 15 | |
| vizz | Privacy-Enhanced Mail? | 25 | |
| 756TrollerLujanC | Working with Fields | 10 | |
| CastorJr | ECB CBC WTF | 55 | |
| RezaWijayanti | Bringing It All Together | 50 | |
| radare | Hide and seek (ECSC 2023 (Norway)) | 0 | |
| Emma2266 | Modular Arithmetic 1 | 20 | |
| peter941221 | Favourite byte | 20 | |
| TikiPete | Bytes and Big Integers | 10 | |
| TikiPete | Base64 | 10 | |
| RezaWijayanti | Diffusion through Permutation | 30 | |
| joko | Hash Stuffing | 50 | |
| RezaWijayanti | Confusion through Substitution | 25 | |
| crypto101 | Extended GCD | 20 | |
| SoonOOv | Passwords as Keys | 50 | |
| RezaWijayanti | Round Keys | 20 | |
| TikiPete | Hex | 5 | |
| TikiPete | ASCII | 5 | |
| RezaWijayanti | Structure of AES | 15 | |
| phat1911 | Legendre Symbol | 35 | |
| RezaWijayanti | Resisting Bruteforce | 10 | |
| TikiPete | Great Snakes | 3 | |
| RezaWijayanti | Keyed Permutations | 5 | |
| quangntenemy | Jeff's LFSR | 150 | |
| TikiPete | Finding Flags | 2 |
You are now level Current level