| Date | User | Challenge | Score |
| anbarbon | You either know, XOR you don't | 30 | |
| vitt | XOR Properties | 15 | |
| joaotheboss | Resisting Bruteforce | 10 | |
| NicoNieners | Diffusion through Permutation | 30 | |
| Spirit12 | Quadratic Residues | 25 | |
| joaotheboss | Keyed Permutations | 5 | |
| 0xOuss | ASCII | 5 | |
| linaaaaaaaaaaaaa | XOR Starter | 10 | |
| 0xOuss | Great Snakes | 3 | |
| lavi24 | Modular Inverting | 25 | |
| spaceblanket | Point Negation | 10 | |
| 0xOuss | Finding Flags | 2 | |
| apeer | Great Snakes | 3 | |
| teun | Chinese Remainder Theorem | 40 | |
| vitt | XOR Starter | 10 | |
| cripsovv | XOR Starter | 10 | |
| Spirit12 | Modular Inverting | 25 | |
| vitt | Bytes and Big Integers | 10 | |
| lavi24 | Privacy-Enhanced Mail? | 25 | |
| 24BECSE19_DT | Deriving Symmetric Keys | 40 | |
| cripsovv | Bytes and Big Integers | 10 | |
| eugeniahwd | Base64 | 10 | |
| 24BECSE19_DT | Computing Shared Secrets | 30 | |
| 24BECSE19_DT | Computing Public Values | 25 | |
| 24BECSE19_DT | Generators of Groups | 20 | |
| 24BECSE19_DT | Working with Fields | 10 | |
| Spirit12 | Modular Arithmetic 2 | 20 | |
| 24BECSE19_DT | Modulus Inutilis | 50 | |
| 24BECSE19_DT | Salty | 20 | |
| Htet | Vote for Pedro | 150 | |
| Htet | Signing Server | 60 | |
| thaggs1066 | JSON in JSON | 40 | |
| Htet | Let's Decrypt | 80 | |
| eugeniahwd | Hex | 5 | |
| Htet | Blinding Light | 120 | |
| 3xMB | Modular Arithmetic 2 | 20 | |
| eugeniahwd | ASCII | 5 | |
| Htet | Let's Decrypt Again | 175 | |
| hashiryo | Modular Square Root | 35 | |
| Zira | Deriving Symmetric Keys | 40 | |
| 3xMB | Modular Arithmetic 1 | 20 | |
| eugeniahwd | Great Snakes | 3 | |
| lavi24 | CERTainly not | 30 | |
| eugeniahwd | Finding Flags | 2 | |
| SigmaMonster | Modular Inverting | 25 | |
| viecon | L-Win | 120 | |
| shirasu2006 | Greatest Common Divisor | 15 | |
| Htet | Salty | 20 | |
| Htet | Manyprime | 40 | |
| Htet | Square Eyes | 35 |
You are now level Current level