| Date | User | Challenge | Score |
| Makdsak666 | Modular Arithmetic 2 | 20 | |
| skiller3478 | Common Ground | 75 | |
| sanDer153 | Modular Inverting | 25 | |
| Makdsak666 | Modular Arithmetic 1 | 20 | |
| Lelle | Common Ground | 75 | |
| sanDer153 | Modular Arithmetic 2 | 20 | |
| Makdsak666 | Extended GCD | 20 | |
| Rezebombdevil | Diffusion through Permutation | 30 | |
| Makdsak666 | Greatest Common Divisor | 15 | |
| Makdsak666 | You either know, XOR you don't | 30 | |
| Makdsak666 | Favourite byte | 20 | |
| misterpurple | LWE Background | 5 | |
| zjh | ASCII | 5 | |
| sanDer153 | Modular Arithmetic 1 | 20 | |
| Makdsak666 | XOR Properties | 15 | |
| Makdsak666 | XOR Starter | 10 | |
| Makdsak666 | Bytes and Big Integers | 10 | |
| Makdsak666 | Base64 | 10 | |
| tianyuan | Flipping Cookie | 60 | |
| zjh | Great Snakes | 3 | |
| Makdsak666 | Hex | 5 | |
| winglet | Quadratic Residues | 25 | |
| Makdsak666 | ASCII | 5 | |
| noah_parker | XOR Starter | 10 | |
| Makdsak666 | Great Snakes | 3 | |
| jeydpbb | Stream of Consciousness | 80 | |
| Walid2001 | Bytes and Big Integers | 10 | |
| noah_parker | Bytes and Big Integers | 10 | |
| djfc | Passwords as Keys | 50 | |
| alm | Real Eisenstein | 150 | |
| Makdsak666 | Finding Flags | 2 | |
| jiaojiao | Manyprime | 40 | |
| alm | Unencryptable | 125 | |
| cedric013 | Sus (ImaginaryCTF) | 0 | |
| noah_parker | Base64 | 10 | |
| nhuhung37 | LWE Background | 5 | |
| 0xdelphine404 | Lemur XOR | 40 | |
| nellie | ProSign 3 | 100 | |
| noah_parker | Hex | 5 | |
| cedric013 | Blind (ECSC 2023 (Norway)) | 0 | |
| noah_parker | ASCII | 5 | |
| nellie | Curveball | 100 | |
| Dizere | Modular Inverting | 25 | |
| nellie | Smooth Criminal | 60 | |
| Zcaesar | Confusion through Substitution | 25 | |
| noah_parker | Great Snakes | 3 | |
| nellie | Montgomery's Ladder | 40 | |
| yang123 | ASCII | 5 | |
| Catherinenjoki | Hex | 5 | |
| nellie | Efficient Exchange | 50 |
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