| Date | User | Challenge | Score |
| quangtiencu | Favourite byte | 20 | |
| whoami4 | Sharks on the Wire | 10 | |
| Fr0ger | RSA Decryption | 20 | |
| TheWatcher | Hex | 5 | |
| 1Lovef0xy | Greatest Common Divisor | 15 | |
| Sc4rl3t | Chinese Remainder Theorem | 40 | |
| Fr0ger | Private Keys | 20 | |
| Fr0ger | Euler's Totient | 20 | |
| test3462424 | ASCII | 5 | |
| Fr0ger | Public Keys | 15 | |
| Quily | Legendre Symbol | 35 | |
| test3462424 | Great Snakes | 3 | |
| CalinChis | Finding Flags | 2 | |
| secrect_guy2013 | Hex | 5 | |
| test3462424 | Finding Flags | 2 | |
| secrect_guy2013 | ASCII | 5 | |
| secrect_guy2013 | Great Snakes | 3 | |
| tui101 | You either know, XOR you don't | 30 | |
| 25520158 | CERTainly not | 30 | |
| s1ny4nz | Modular Inverting | 25 | |
| s1ny4nz | Modular Arithmetic 2 | 20 | |
| Milek192 | Base64 | 10 | |
| s1ny4nz | Modular Arithmetic 1 | 20 | |
| s1ny4nz | Extended GCD | 20 | |
| 25520158 | Privacy-Enhanced Mail? | 25 | |
| secrect_guy2013 | Finding Flags | 2 | |
| Torben | Bytes and Big Integers | 10 | |
| tui101 | Favourite byte | 20 | |
| olston | What's a Lattice? | 40 | |
| mahu | SSH Keys | 35 | |
| durga_prasanna | Round Keys | 20 | |
| fjukh7872 | Hamiltonicity (CryptoHack) | 0 | |
| fjukh7872 | Hamiltonicity 1 | 100 | |
| Voxa | Passwords as Keys | 50 | |
| 25520158 | Modular Inverting | 25 | |
| crisis82 | Roll your Own | 125 | |
| hoc | Euler's Totient | 20 | |
| davide_rebuffo | Lazy CBC | 60 | |
| durga_prasanna | Structure of AES | 15 | |
| Velisar | Modular Arithmetic 2 | 20 | |
| Torben | Base64 | 10 | |
| 25520158 | Modular Arithmetic 2 | 20 | |
| 25520158 | Modular Arithmetic 1 | 20 | |
| olston | Gram Schmidt | 30 | |
| mypalpal | Non-Interactive | 35 | |
| 25520158 | Extended GCD | 20 | |
| noohC10V0 | Base64 | 10 | |
| noohC10V0 | Hex | 5 | |
| durga_prasanna | Resisting Bruteforce | 10 | |
| hoc | Public Keys | 15 |
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