| Date | User | Challenge | Score |
| alfattd | Transparency | 50 | |
| cigamaLTT | Greatest Common Divisor | 15 | |
| ArceusBantai | Great Snakes | 3 | |
| thang2006 | Favourite byte | 20 | |
| somesalmon | Round Keys | 20 | |
| pc417 | Saying Hello | 20 | |
| thang2006 | XOR Properties | 15 | |
| somesalmon | Structure of AES | 15 | |
| ArceusBantai | Finding Flags | 2 | |
| Hanan | Chinese Remainder Theorem | 40 | |
| EcheExpert | Round Keys | 20 | |
| luwofi | Point Addition | 30 | |
| Hanan | Modular Square Root | 35 | |
| thang2006 | XOR Starter | 10 | |
| jaiveersingh | Confusion through Substitution | 25 | |
| Hanan | Legendre Symbol | 35 | |
| dust9955 | Great Snakes | 3 | |
| Hanan | Quadratic Residues | 25 | |
| thang2006 | Encoding Challenge | 40 | |
| dlhxfy | Deriving Symmetric Keys | 40 | |
| liangmeigang | No Random, No Bias | 120 | |
| ameermouhammed | Adrien's Signs | 80 | |
| EcheExpert | Structure of AES | 15 | |
| somesalmon | Resisting Bruteforce | 10 | |
| ameermouhammed | Chinese Remainder Theorem | 40 | |
| ameermouhammed | Modular Square Root | 35 | |
| Blue_ | Elliptic Nodes | 150 | |
| thang2006 | Bytes and Big Integers | 10 | |
| alfattd | SSH Keys | 35 | |
| hwanhasdfadf | Background Reading | 5 | |
| ameermouhammed | Legendre Symbol | 35 | |
| hwanhasdfadf | Efficient Exchange | 50 | |
| thang2006 | Network Attacks | 5 | |
| alfattd | CERTainly not | 30 | |
| elgasing21 | Resisting Bruteforce | 10 | |
| elgasing21 | Keyed Permutations | 5 | |
| thvtey | ASCII | 5 | |
| ameermouhammed | Quadratic Residues | 25 | |
| EcheExpert | Resisting Bruteforce | 10 | |
| thvtey | Great Snakes | 3 | |
| thvtey | Finding Flags | 2 | |
| EcheExpert | Keyed Permutations | 5 | |
| kieugiathinhphat | Jack's Birthday Confusion | 30 | |
| elgasing21 | Lemur XOR | 40 | |
| alfattd | Privacy-Enhanced Mail? | 25 | |
| YCHuang | Factoring | 15 | |
| kieugiathinhphat | Jack's Birthday Hash | 20 | |
| elgasing21 | Encoding Challenge | 40 | |
| joke_rf1 | Hex | 5 | |
| sai0742 | Great Snakes | 3 |
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