| Date | User | Challenge | Score |
| mustapha880 | RSA vs RNG | 150 | |
| kevinlean | Modular Arithmetic 2 | 20 | |
| euh0e | Efficient Exchange | 50 | |
| KevC | Euler's Totient | 20 | |
| Anary | Bean Counter | 60 | |
| Anary | Symmetry | 50 | |
| polybius | Base64 | 10 | |
| Anary | Flipping Cookie | 60 | |
| Anary | ECB CBC WTF | 55 | |
| polybius | Hex | 5 | |
| Anary | ECB Oracle | 60 | |
| polybius | ASCII | 5 | |
| S0laReX | XOR Starter | 10 | |
| HoangNhoo | Deriving Symmetric Keys | 40 | |
| HoangNhoo | Computing Shared Secrets | 30 | |
| HoangNhoo | Computing Public Values | 25 | |
| HoangNhoo | Generators of Groups | 20 | |
| turska | Point Negation | 10 | |
| polybius | Great Snakes | 3 | |
| Rose_Virus | Great Snakes | 3 | |
| polybius | Finding Flags | 2 | |
| Anary | Passwords as Keys | 50 | |
| luucmeldgaard | Greatest Common Divisor | 15 | |
| mortac | RRSSAA (ECSC 2023 (Norway)) | 0 | |
| aedraline | Base64 | 10 | |
| aedraline | Hex | 5 | |
| ShaharHam | Finding Flags | 2 | |
| aedraline | ASCII | 5 | |
| aedraline | Great Snakes | 3 | |
| aedraline | Finding Flags | 2 | |
| HoangNhoo | Working with Fields | 10 | |
| kev6 | Extended GCD | 20 | |
| Anary | Modes of Operation Starter | 15 | |
| HoangNhoo | Modulus Inutilis | 50 | |
| maksushka | LWE Low Bits Message | 20 | |
| Anary | Bringing It All Together | 50 | |
| Anary | Diffusion through Permutation | 30 | |
| Anary | Confusion through Substitution | 25 | |
| Anary | Round Keys | 20 | |
| xz3r0 | ASCII | 5 | |
| Anary | Structure of AES | 15 | |
| HoangNhoo | Salty | 20 | |
| Anary | Resisting Bruteforce | 10 | |
| luucmeldgaard | You either know, XOR you don't | 30 | |
| Anary | Keyed Permutations | 5 | |
| HoangNhoo | Manyprime | 40 | |
| nicocamba | ASCII | 5 | |
| xz3r0 | Great Snakes | 3 | |
| nicocamba | Great Snakes | 3 | |
| xz3r0 | Finding Flags | 2 |
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