| Date | User | Challenge | Score |
| Jimmyn | You either know, XOR you don't | 30 | |
| ntfd | Modular Inverting | 25 | |
| ntfd | Modular Arithmetic 2 | 20 | |
| ntfd | Modular Arithmetic 1 | 20 | |
| ntfd | Extended GCD | 20 | |
| Chnapak | Favourite byte | 20 | |
| ntfd | Greatest Common Divisor | 15 | |
| sothyhuot | ASCII | 5 | |
| Chnapak | XOR Properties | 15 | |
| ntfd | Lemur XOR | 40 | |
| noTun4 | ASCII | 5 | |
| Chnapak | XOR Starter | 10 | |
| sothyhuot | Great Snakes | 3 | |
| Alan233 | Marin's Secrets | 50 | |
| sothyhuot | Finding Flags | 2 | |
| m1kp4 | Bean Counter | 60 | |
| ntfd | You either know, XOR you don't | 30 | |
| ntfd | Favourite byte | 20 | |
| ntfd | XOR Properties | 15 | |
| Jimmyn | Favourite byte | 20 | |
| ntfd | XOR Starter | 10 | |
| noTun4 | Great Snakes | 3 | |
| noTun4 | Finding Flags | 2 | |
| ntfd | Encoding Challenge | 40 | |
| vdvk10vd10 | Great Snakes | 3 | |
| Chnapak | Bytes and Big Integers | 10 | |
| Kaela | Passwords as Keys | 50 | |
| moaoifff | Favourite byte | 20 | |
| Chnapak | Base64 | 10 | |
| Chnapak | Hex | 5 | |
| Chnapak | ASCII | 5 | |
| Chnapak | Great Snakes | 3 | |
| Chnapak | Finding Flags | 2 | |
| moaoifff | XOR Properties | 15 | |
| Jimmyn | XOR Properties | 15 | |
| m1kp4 | Symmetry | 50 | |
| JoeNgala | Confusion through Substitution | 25 | |
| MrOblivion | Bytes and Big Integers | 10 | |
| GK7Thebigboss | Modes of Operation Starter | 15 | |
| s4b0 | Finding Flags | 2 | |
| ntfd | Bytes and Big Integers | 10 | |
| JoeNgala | Round Keys | 20 | |
| ntfd | Base64 | 10 | |
| ntfd | Hex | 5 | |
| ntfd | ASCII | 5 | |
| ntfd | Network Attacks | 5 | |
| harishreddy4653 | XOR Starter | 10 | |
| JoeNgala | Structure of AES | 15 | |
| justin31121 | Quadratic Residues | 25 | |
| Jimmyn | XOR Starter | 10 |
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