| Date | User | Challenge | Score |
| c0mpos3r99 | Modular Inverting | 25 | |
| Kevin_Munene | You either know, XOR you don't | 30 | |
| paulk | Finding Flags | 2 | |
| Kevin_Munene | Favourite byte | 20 | |
| zhacutis1tg | Public Keys | 15 | |
| diaohm2002 | XOR Properties | 15 | |
| stpt | Adrien's Signs | 80 | |
| MeowSonic | Dancing Queen | 120 | |
| Kevin_Munene | XOR Properties | 15 | |
| Kevin_Munene | XOR Starter | 10 | |
| Kevin_Munene | Bytes and Big Integers | 10 | |
| Kevin_Munene | Base64 | 10 | |
| zhacutis1tg | Modular Exponentiation | 10 | |
| Kevin_Munene | Hex | 5 | |
| Iris1705 | ECB CBC WTF | 55 | |
| Kevin_Munene | ASCII | 5 | |
| Kevin_Munene | Great Snakes | 3 | |
| diaohm2002 | XOR Starter | 10 | |
| cryto_king | You either know, XOR you don't | 30 | |
| Kevin_Munene | Finding Flags | 2 | |
| test_dhkt | SSH Keys | 35 | |
| test_dhkt | CERTainly not | 30 | |
| Neutr0nys | Backpack Cryptography | 120 | |
| test_dhkt | Privacy-Enhanced Mail? | 25 | |
| test_dhkt | Modular Inverting | 25 | |
| Iris1705 | Modes of Operation Starter | 15 | |
| jaehyeon | Adrien's Signs | 80 | |
| test_dhkt | Modular Arithmetic 2 | 20 | |
| Neutr0nys | Find the Lattice | 100 | |
| test_dhkt | Modular Arithmetic 1 | 20 | |
| zhacutis1tg | Flipping Cookie | 60 | |
| mholmes24 | Bruce Schneier's Password | 100 | |
| jaehyeon | Chinese Remainder Theorem | 40 | |
| test_dhkt | Extended GCD | 20 | |
| test_dhkt | Greatest Common Divisor | 15 | |
| Iris1705 | Passwords as Keys | 50 | |
| test_dhkt | Lemur XOR | 40 | |
| phuctrung | Prime and Prejudice | 200 | |
| DangKhoaVox | Deriving Symmetric Keys | 40 | |
| jaehyeon | Modular Square Root | 35 | |
| erugviru | Modular Inverting | 25 | |
| test_dhkt | You either know, XOR you don't | 30 | |
| TheKY | Modular Binomials | 80 | |
| test_dhkt | Favourite byte | 20 | |
| test_dhkt | XOR Properties | 15 | |
| SHerlockHolmesE | Greatest Common Divisor | 15 | |
| zhacutis1tg | ECB Oracle | 60 | |
| stpt | Successive Powers | 60 | |
| erugviru | Modular Arithmetic 2 | 20 | |
| jaehyeon | Legendre Symbol | 35 |
You are now level Current level