| Date | User | Challenge | Score |
| b0510 | Quadratic Residues | 25 | |
| Solitarius1upus | XOR Starter | 10 | |
| Qu1n7as | Static Client 2 | 120 | |
| Siddsh | You either know, XOR you don't | 30 | |
| haroune8987 | XOR Properties | 15 | |
| CryptLynn | Hex | 5 | |
| CryptLynn | ASCII | 5 | |
| Siddsh | Favourite byte | 20 | |
| rolanp | XOR Properties | 15 | |
| Jach | Great Snakes | 3 | |
| Qu1n7as | Static Client | 100 | |
| Marwa_Ayman | Bean Counter | 60 | |
| Betel | Extended GCD | 20 | |
| Jach | Finding Flags | 2 | |
| Siddsh | XOR Properties | 15 | |
| z8v5nr4d | Efficient Exchange | 50 | |
| b0510 | Modular Inverting | 25 | |
| Betel | Greatest Common Divisor | 15 | |
| z8v5nr4d | Curves and Logs | 40 | |
| Aisultan | Unencryptable | 125 | |
| Ugo | Bytes and Big Integers | 10 | |
| Aisultan | Ellipse Curve Cryptography | 125 | |
| Aisultan | No Way Back Home | 100 | |
| Aisultan | Broken RSA | 100 | |
| Aisultan | Modular Binomials | 80 | |
| Ugo | Base64 | 10 | |
| Ugo | Hex | 5 | |
| Aisultan | Adrien's Signs | 80 | |
| 7_One_That | Favourite byte | 20 | |
| Betel | You either know, XOR you don't | 30 | |
| Ugo | ASCII | 5 | |
| Aisultan | Oh SNAP | 120 | |
| Aisultan | Dancing Queen | 120 | |
| userkill | Base64 | 10 | |
| Aisultan | Stream of Consciousness | 80 | |
| Ugo | Great Snakes | 3 | |
| dlesk | JSON in JSON | 40 | |
| Aisultan | CTRIME | 70 | |
| Aisultan | Triple DES | 60 | |
| userkill | Hex | 5 | |
| Aisultan | Lazy CBC | 60 | |
| CryptLynn | Great Snakes | 3 | |
| Solitarius1upus | Bytes and Big Integers | 10 | |
| Aisultan | Flipping Cookie | 60 | |
| Ugo | Finding Flags | 2 | |
| userkill | ASCII | 5 | |
| b0510 | Modular Arithmetic 2 | 20 | |
| userkill | Network Attacks | 5 | |
| CryptLynn | Finding Flags | 2 | |
| Qu1n7as | Export-grade | 100 |
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