| Date | User | Challenge | Score |
| afrdian | Marin's Secrets | 50 | |
| jkendall | Working with Fields | 10 | |
| nate73duck | Greatest Common Divisor | 15 | |
| jkendall | Modulus Inutilis | 50 | |
| afrdian | Infinite Descent | 50 | |
| nate73duck | You either know, XOR you don't | 30 | |
| anacin27 | Chinese Remainder Theorem | 40 | |
| anacin27 | Modular Square Root | 35 | |
| anacin27 | Legendre Symbol | 35 | |
| nate73duck | Favourite byte | 20 | |
| afrdian | Endless Emails | 150 | |
| jkendall | Salty | 20 | |
| sharknpls | Modular Binomials | 80 | |
| s3n71n31 | Network Attacks | 5 | |
| anacin27 | Quadratic Residues | 25 | |
| anacin27 | Modular Inverting | 25 | |
| Xjoya | Great Snakes | 3 | |
| anacin27 | Modular Arithmetic 2 | 20 | |
| wekito | Hamiltonicity 2 | 175 | |
| wekito | Hamiltonicity 2 (CryptoHack) | 0 | |
| anacin27 | Modular Arithmetic 1 | 20 | |
| anacin27 | Extended GCD | 20 | |
| anacin27 | Greatest Common Divisor | 15 | |
| jkendall | Manyprime | 40 | |
| Xjoya | Finding Flags | 2 | |
| cyrptoBeginner05 | Base64 | 10 | |
| Tryaker | Great Snakes | 3 | |
| cyrptoBeginner05 | Great Snakes | 3 | |
| quantum_cracking | ECB Oracle | 60 | |
| cyrptoBeginner05 | Finding Flags | 2 | |
| Pt1 | Great Snakes | 3 | |
| cyrptoBeginner05 | Hex | 5 | |
| cyrptoBeginner05 | ASCII | 5 | |
| Marcus1717 | Bean Counter | 60 | |
| Pt1 | Finding Flags | 2 | |
| Marcus1717 | Symmetry | 50 | |
| k906084 | Network Attacks | 5 | |
| Marcus1717 | Flipping Cookie | 60 | |
| Marcus1717 | ECB CBC WTF | 55 | |
| sulinno | Gram Schmidt | 30 | |
| Marcus1717 | ECB Oracle | 60 | |
| Aloutrance | Lemur XOR | 40 | |
| Marcus1717 | Passwords as Keys | 50 | |
| Marcus1717 | Modes of Operation Starter | 15 | |
| Marcus1717 | Bringing It All Together | 50 | |
| Marcus1717 | Diffusion through Permutation | 30 | |
| Marcus1717 | Confusion through Substitution | 25 | |
| Marcus1717 | Round Keys | 20 | |
| abue1mjd | You either know, XOR you don't | 30 | |
| Marcus1717 | Structure of AES | 15 |
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