| Date | User | Challenge | Score |
| 3322cori | XOR Properties | 15 | |
| ran123 | Great Snakes | 3 | |
| ran123 | Finding Flags | 2 | |
| chchh | Greatest Common Divisor | 15 | |
| GoSlowPoke | XOR Properties | 15 | |
| hackerpj12 | Static Client | 100 | |
| nhatminh_dz2k7 | Hex | 5 | |
| valh4x | Static Client | 100 | |
| dorado8 | Salty | 20 | |
| GoSlowPoke | XOR Starter | 10 | |
| shion | Hex | 5 | |
| kimjihoon3106 | You either know, XOR you don't | 30 | |
| dorado8 | Monoprime | 30 | |
| nhatminh_dz2k7 | ASCII | 5 | |
| nhatminh_dz2k7 | Great Snakes | 3 | |
| shion | ASCII | 5 | |
| shion | Great Snakes | 3 | |
| shion | Finding Flags | 2 | |
| randomstar | Chinese Remainder Theorem | 40 | |
| trung0308 | Great Snakes | 3 | |
| 3322cori | XOR Starter | 10 | |
| ripemo | Favourite byte | 20 | |
| ripemo | XOR Properties | 15 | |
| Arriccio | Background Reading | 5 | |
| randomstar | Modular Square Root | 35 | |
| valh4x | Additive | 70 | |
| valh4x | Export-grade | 100 | |
| ripemo | XOR Starter | 10 | |
| dorado8 | Square Eyes | 35 | |
| trung0308 | Finding Flags | 2 | |
| ripemo | Bytes and Big Integers | 10 | |
| eternalstrike | Collider | 50 | |
| valh4x | Parameter Injection | 60 | |
| randomstar | Legendre Symbol | 35 | |
| valh4x | Computing Shared Secrets | 30 | |
| kimjihoon3106 | Favourite byte | 20 | |
| valh4x | Computing Public Values | 25 | |
| valh4x | Generators of Groups | 20 | |
| valh4x | Working with Fields | 10 | |
| valh4x | Deriving Symmetric Keys | 40 | |
| thienstephen | Gram Schmidt | 30 | |
| 3322cori | Bytes and Big Integers | 10 | |
| nml | Hex | 5 | |
| 3322cori | Base64 | 10 | |
| Dxrie | CERTainly not | 30 | |
| dorado8 | Inferius Prime | 30 | |
| randomstar | Quadratic Residues | 25 | |
| 3322cori | Hex | 5 | |
| dorado8 | Factoring | 15 | |
| Dxrie | Privacy-Enhanced Mail? | 25 |
You are now level Current level