| Date | User | Challenge | Score |
| Y0N3S | Modular Inverting | 25 | |
| Mochibou | ASCII | 5 | |
| alaaabdelmaksod | Chinese Remainder Theorem | 40 | |
| alaaabdelmaksod | Modular Square Root | 35 | |
| jcabala | Round Keys | 20 | |
| alaaabdelmaksod | Legendre Symbol | 35 | |
| 0xrac | Favourite byte | 20 | |
| NitroN | Bytes and Big Integers | 10 | |
| Mochibou | Great Snakes | 3 | |
| alaaabdelmaksod | Quadratic Residues | 25 | |
| alaaabdelmaksod | Modular Inverting | 25 | |
| KazatelPetr | Greatest Common Divisor | 15 | |
| jcabala | Structure of AES | 15 | |
| thaggs1066 | Manyprime | 40 | |
| 0xrac | XOR Properties | 15 | |
| bibroCipher | XOR Starter | 10 | |
| alaaabdelmaksod | Modular Arithmetic 2 | 20 | |
| 0506hil | Transparency | 50 | |
| Hippocampe | RSA Decryption | 20 | |
| Mochibou | Finding Flags | 2 | |
| Y0N3S | Modular Arithmetic 2 | 20 | |
| 0506hil | SSH Keys | 35 | |
| jcabala | Resisting Bruteforce | 10 | |
| Zysee | Diffusion through Permutation | 30 | |
| 0506hil | CERTainly not | 30 | |
| mahu | Bespoke Padding | 100 | |
| NitroN | Base64 | 10 | |
| 0506hil | Privacy-Enhanced Mail? | 25 | |
| jcabala | Keyed Permutations | 5 | |
| NitroN | Hex | 5 | |
| 0506hil | Modular Inverting | 25 | |
| NitroN | ASCII | 5 | |
| 0506hil | Modular Arithmetic 2 | 20 | |
| 0506hil | Modular Arithmetic 1 | 20 | |
| Huyyeuthu2104 | Hash Stuffing | 50 | |
| KazatelPetr | You either know, XOR you don't | 30 | |
| mehtasec | Bytes and Big Integers | 10 | |
| spatino | Logon Zero | 80 | |
| NitroN | Great Snakes | 3 | |
| NitroN | Finding Flags | 2 | |
| Hippocampe | Private Keys | 20 | |
| senec4 | XOR Starter | 10 | |
| usr1 | XOR Starter | 10 | |
| KazatelPetr | Favourite byte | 20 | |
| redfl0wer | Encoding Challenge | 40 | |
| aboateng124 | Resisting Bruteforce | 10 | |
| usr1 | Bytes and Big Integers | 10 | |
| KazatelPetr | Encoding Challenge | 40 | |
| KazatelPetr | XOR Properties | 15 | |
| ghaisan | Inferius Prime | 30 |
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