| Date | User | Challenge | Score |
| gruenerheli | Chinese Remainder Theorem | 40 | |
| battos | Modular Arithmetic 1 | 20 | |
| denarzai | Favourite byte | 20 | |
| Vlad_Valar | Encoding Challenge | 40 | |
| battos | Extended GCD | 20 | |
| NekoRolly | Favourite byte | 20 | |
| Eggnog | ASCII | 5 | |
| gruenerheli | Modular Square Root | 35 | |
| kray_dawrg | Base64 | 10 | |
| Eggnog | Great Snakes | 3 | |
| battos | Greatest Common Divisor | 15 | |
| kray_dawrg | Hex | 5 | |
| Amro_Hussein | Factoring | 15 | |
| Eggnog | Finding Flags | 2 | |
| Sayan9615 | Legendre Symbol | 35 | |
| NekoRolly | XOR Properties | 15 | |
| Cyberseal | XOR Starter | 10 | |
| Amro_Hussein | RSA Signatures | 25 | |
| Zira | Round Keys | 20 | |
| MrRed | Favourite byte | 20 | |
| gigisoave | Modular Inverting | 25 | |
| Cyberseal | Bytes and Big Integers | 10 | |
| 1502dthw | Hex | 5 | |
| kacpersowka | Manyprime | 40 | |
| MrRed | XOR Properties | 15 | |
| Sayan9615 | Quadratic Residues | 25 | |
| NekoRolly | XOR Starter | 10 | |
| Zira | Structure of AES | 15 | |
| mehtasec | Euler's Totient | 20 | |
| NekoRolly | Bytes and Big Integers | 10 | |
| denarzai | XOR Properties | 15 | |
| gigisoave | Modular Arithmetic 2 | 20 | |
| MrRed | XOR Starter | 10 | |
| Vlad_Valar | Bytes and Big Integers | 10 | |
| 1502dthw | ASCII | 5 | |
| NekoRolly | Base64 | 10 | |
| MrRed | Bytes and Big Integers | 10 | |
| Adrinn | Confusion through Substitution | 25 | |
| Vlad_Valar | Base64 | 10 | |
| JCooker | Structure of AES | 15 | |
| 1502dthw | Network Attacks | 5 | |
| gigisoave | Modular Arithmetic 1 | 20 | |
| NekoRolly | Hex | 5 | |
| Vlad_Valar | Hex | 5 | |
| Fatiimaaa | You either know, XOR you don't | 30 | |
| 1502dthw | Great Snakes | 3 | |
| starmie3700 | Modes of Operation Starter | 15 | |
| NekoRolly | ASCII | 5 | |
| JCooker | Resisting Bruteforce | 10 | |
| NekoRolly | Great Snakes | 3 |
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