| Date | User | Challenge | Score |
| phantasm | Favourite byte | 20 | |
| daivdhack123 | Extended GCD | 20 | |
| auraman67 | SSH Keys | 35 | |
| MonkiPrince | ASCII | 5 | |
| PlumpLad391 | Privacy-Enhanced Mail? | 25 | |
| auraman67 | CERTainly not | 30 | |
| MonkiPrince | Great Snakes | 3 | |
| yoavb | Diffusion through Permutation | 30 | |
| brf | Hex | 5 | |
| PlumpLad391 | Encoding Challenge | 40 | |
| brf | ASCII | 5 | |
| auraman67 | Privacy-Enhanced Mail? | 25 | |
| MonkiPrince | Finding Flags | 2 | |
| yoavb | Confusion through Substitution | 25 | |
| cihiaiiin | Greatest Common Divisor | 15 | |
| PescaruS | Modular Arithmetic 1 | 20 | |
| BiasedVelocity | Modular Inverting | 25 | |
| BiasedVelocity | Modular Arithmetic 2 | 20 | |
| pony | Quadratic Residues | 25 | |
| PescaruS | Extended GCD | 20 | |
| no_ai_no_problem | Micro Transmissions | 120 | |
| KZOrP4Vl | Broken RSA | 100 | |
| yoavb | Round Keys | 20 | |
| studentunique | Symmetry | 50 | |
| cihiaiiin | You either know, XOR you don't | 30 | |
| yoavb | Structure of AES | 15 | |
| anon7vip | Base64 | 10 | |
| PescaruS | Greatest Common Divisor | 15 | |
| HetiHernawanti | Modular Exponentiation | 10 | |
| yoavb | Resisting Bruteforce | 10 | |
| mopedist | Unencryptable | 125 | |
| yoavb | Keyed Permutations | 5 | |
| KZOrP4Vl | Modular Binomials | 80 | |
| stako | XOR Starter | 10 | |
| marco44 | Salty | 20 | |
| mopedist | Roll your Own | 125 | |
| mopedist | Ellipse Curve Cryptography | 125 | |
| mmayabi | Legendre Symbol | 35 | |
| Disco19 | Finding Flags | 2 | |
| bagas | Finding Flags | 2 | |
| dexter_nate27 | Signing Server | 60 | |
| Preslav | Hex | 5 | |
| mopedist | No Way Back Home | 100 | |
| PescaruS | You either know, XOR you don't | 30 | |
| user1300 | Generators of Groups | 20 | |
| bdtcorentin | Greatest Common Divisor | 15 | |
| Preslav | ASCII | 5 | |
| Leizoe | Modular Binomials | 80 | |
| setyawan | RSA Signatures | 25 | |
| mopedist | Broken RSA | 100 |
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