| Date | User | Challenge | Score |
| Lemoon | Hex | 5 | |
| Lemoon | ASCII | 5 | |
| Lemoon | Great Snakes | 3 | |
| o1101ol | Private Keys | 20 | |
| jell | CTRIME | 70 | |
| jell | Modular Binomials | 80 | |
| Lemoon | Finding Flags | 2 | |
| o1101ol | Euler's Totient | 20 | |
| jell | Adrien's Signs | 80 | |
| o1101ol | Public Keys | 15 | |
| o1101ol | Modular Exponentiation | 10 | |
| braier | Modular Inverting | 25 | |
| o1101ol | Symmetry | 50 | |
| Hexerei | Chinese Remainder Theorem | 40 | |
| o1101ol | ECB CBC WTF | 55 | |
| jell | Successive Powers | 60 | |
| jell | Chinese Remainder Theorem | 40 | |
| o1101ol | ECB Oracle | 60 | |
| donkey_kong | Structure of AES | 15 | |
| braier | Modular Arithmetic 2 | 20 | |
| o1101ol | Passwords as Keys | 50 | |
| donkey_kong | Resisting Bruteforce | 10 | |
| braier | Modular Arithmetic 1 | 20 | |
| pseudonymous_ | Salty | 20 | |
| donkey_kong | Keyed Permutations | 5 | |
| 4rg0 | Favourite byte | 20 | |
| braier | Extended GCD | 20 | |
| pseudonymous_ | Monoprime | 30 | |
| richmoneybank479 | Euler's Totient | 20 | |
| richmoneybank479 | Public Keys | 15 | |
| pseudonymous_ | Factoring | 15 | |
| o1101ol | Modes of Operation Starter | 15 | |
| richmoneybank479 | Modular Exponentiation | 10 | |
| decentzach | You either know, XOR you don't | 30 | |
| decentzach | Favourite byte | 20 | |
| jac0 | JSON in JSON | 40 | |
| skidsstring | Base64 | 10 | |
| pseudonymous_ | RSA Decryption | 20 | |
| zhivvv | XOR Properties | 15 | |
| pseudonymous_ | Private Keys | 20 | |
| pseudonymous_ | Euler's Totient | 20 | |
| skidsstring | Hex | 5 | |
| pseudonymous_ | Public Keys | 15 | |
| Arsen123 | ECB Oracle | 60 | |
| Arsen123 | ECB CBC WTF | 55 | |
| Arsen123 | Passwords as Keys | 50 | |
| jac0 | RSA or HMAC? | 35 | |
| Arsen123 | Modes of Operation Starter | 15 | |
| pseudonymous_ | Modular Exponentiation | 10 | |
| skidsstring | ASCII | 5 |
You are now level Current level