| Date | User | Challenge | Score |
| Adrbqt | Passwords as Keys | 50 | |
| rayaseiren | Couples | 100 | |
| xx33xx | Gaussian Reduction | 50 | |
| yiling | Extended GCD | 20 | |
| rayaseiren | Mister Saplin's Preview | 80 | |
| yiling | Greatest Common Divisor | 15 | |
| 0x1622 | Modular Inverting | 25 | |
| D3yAaN | Monoprime | 30 | |
| nous | Key Backup Service 1 (HKCERT CTF) | 0 | |
| nous | Jack's Birthday Hash | 20 | |
| capucapu | Great Snakes | 3 | |
| 0x1622 | Modular Arithmetic 2 | 20 | |
| capucapu | Finding Flags | 2 | |
| nous | Jack's Birthday Confusion | 30 | |
| Devrar | A True Genus | 175 | |
| DeViator | ASCII | 5 | |
| DeViator | Great Snakes | 3 | |
| 0x1622 | Modular Arithmetic 1 | 20 | |
| DeViator | Finding Flags | 2 | |
| nous | JWT Secrets | 25 | |
| JOJAR | Decrypting TLS 1.3 | 35 | |
| JOJAR | Decrypting TLS 1.2 | 30 | |
| ff02x9e | Extended GCD | 20 | |
| 4AAA4 | Adrien's Signs | 80 | |
| p6k376 | Legendre Symbol | 35 | |
| Aizen14 | Encoding Challenge | 40 | |
| JOJAR | Saying Hello | 20 | |
| ff02x9e | Greatest Common Divisor | 15 | |
| Adrbqt | Modes of Operation Starter | 15 | |
| Arsen123 | Transparency | 50 | |
| Arsen123 | SSH Keys | 35 | |
| Arsen123 | CERTainly not | 30 | |
| Sayat465678 | Bytes and Big Integers | 10 | |
| Arsen123 | Privacy-Enhanced Mail? | 25 | |
| Sayat465678 | Base64 | 10 | |
| Erzhigit | Finding Flags | 2 | |
| Sayat465678 | Hex | 5 | |
| Sayat465678 | ASCII | 5 | |
| JOJAR | TLS Handshake | 15 | |
| Sayat465678 | Great Snakes | 3 | |
| Arsen123 | Lemur XOR | 40 | |
| Sayat465678 | Finding Flags | 2 | |
| Arsen123 | You either know, XOR you don't | 30 | |
| Arsen123 | XOR Properties | 15 | |
| fancylake | Keyed Permutations | 5 | |
| Arsen123 | Hex | 5 | |
| kimdd | Modular Inverting | 25 | |
| 3093016760 | ASCII | 5 | |
| kimdd | Modular Arithmetic 2 | 20 | |
| Meepcom | Round Keys | 20 |
You are now level Current level