| Date | User | Challenge | Score |
| peepoo1234 | Favourite byte | 20 | |
| peepoo1234 | XOR Properties | 15 | |
| Melaveetha | Base64 | 10 | |
| Bright0 | Greatest Common Divisor | 15 | |
| ei15951 | Finding Flags | 2 | |
| Melaveetha | Hex | 5 | |
| iremnt | Extended GCD | 20 | |
| BADWARE | Deriving Symmetric Keys | 40 | |
| Bright0 | Lemur XOR | 40 | |
| Melaveetha | ASCII | 5 | |
| k_k | You either know, XOR you don't | 30 | |
| kiva | Bytes and Big Integers | 10 | |
| Melaveetha | Great Snakes | 3 | |
| hiranoryuto | Favourite byte | 20 | |
| Melaveetha | Finding Flags | 2 | |
| k_k | Favourite byte | 20 | |
| Vintcerf010 | You either know, XOR you don't | 30 | |
| peepoo1234 | XOR Starter | 10 | |
| boboyaga | Passwords as Keys | 50 | |
| BADWARE | Computing Shared Secrets | 30 | |
| lvcv4y | Chinese Remainder Theorem | 40 | |
| peepoo1234 | Bytes and Big Integers | 10 | |
| Vintcerf010 | Favourite byte | 20 | |
| BADWARE | Computing Public Values | 25 | |
| hiranoryuto | XOR Properties | 15 | |
| BADWARE | Generators of Groups | 20 | |
| Wisdom_doom | Passwords as Keys | 50 | |
| k_k | XOR Properties | 15 | |
| traktor | Efficient Exchange | 50 | |
| tode05 | Base64 | 10 | |
| pixelene | XOR Starter | 10 | |
| LaYo | ASCII | 5 | |
| k_k | XOR Starter | 10 | |
| k_k | Encoding Challenge | 40 | |
| kunny | Greatest Common Divisor | 15 | |
| BADWARE | Working with Fields | 10 | |
| iremnt | Greatest Common Divisor | 15 | |
| LaYo | Great Snakes | 3 | |
| adel23 | You either know, XOR you don't | 30 | |
| boboyaga | Modes of Operation Starter | 15 | |
| DELTABE | XOR Properties | 15 | |
| knd | Chinese Remainder Theorem | 40 | |
| sinibida | ECB CBC WTF | 55 | |
| hiranoryuto | XOR Starter | 10 | |
| adel23 | Favourite byte | 20 | |
| M1D0R1M4 | RSA Signatures | 25 | |
| BADWARE | Modulus Inutilis | 50 | |
| lvcv4y | Modular Square Root | 35 | |
| Quytiunhm | Bytes and Big Integers | 10 | |
| adel23 | XOR Properties | 15 |
You are now level Current level