| Date | User | Challenge | Score |
| Duster | Greatest Common Divisor | 15 | |
| darkknight | Modular Inverting | 25 | |
| brayitan | Jack's Birthday Confusion | 30 | |
| brayitan | Jack's Birthday Hash | 20 | |
| SamaTGD | Hex | 5 | |
| darkknight | Modular Arithmetic 2 | 20 | |
| SamaTGD | ASCII | 5 | |
| Duster | You either know, XOR you don't | 30 | |
| parismcv | XOR Starter | 10 | |
| erika_cordoba | Extended GCD | 20 | |
| C4mpoJUL | Quadratic Residues | 25 | |
| sdigs | Working with Fields | 10 | |
| Duster | Favourite byte | 20 | |
| AlexMc99 | Bytes and Big Integers | 10 | |
| Duster | XOR Properties | 15 | |
| ereiselt | Lazy CBC | 60 | |
| parismcv | Bytes and Big Integers | 10 | |
| youssef_reda | Saying Hello | 20 | |
| AlexMc99 | Base64 | 10 | |
| Duster | XOR Starter | 10 | |
| sdigs | Paper Plane | 120 | |
| tfuhrman | ASCII | 5 | |
| C4mpoJUL | Deriving Symmetric Keys | 40 | |
| parismcv | Base64 | 10 | |
| Duster | Bytes and Big Integers | 10 | |
| AlexMc99 | Hex | 5 | |
| C4mpoJUL | Computing Shared Secrets | 30 | |
| parismcv | Hex | 5 | |
| C4mpoJUL | Computing Public Values | 25 | |
| AlexMc99 | ASCII | 5 | |
| Laingameruwu | ECB Oracle | 60 | |
| TotallyNotDash | Bytes and Big Integers | 10 | |
| ayumu_kasuga | Honest Verifier Zero Knowledge | 30 | |
| Laingameruwu | Passwords as Keys | 50 | |
| C4mpoJUL | Generators of Groups | 20 | |
| parismcv | ASCII | 5 | |
| Laingameruwu | Modes of Operation Starter | 15 | |
| C4mpoJUL | Working with Fields | 10 | |
| B0T_o13 | ASCII | 5 | |
| darkknight | Modular Arithmetic 1 | 20 | |
| tfuhrman | Great Snakes | 3 | |
| B0T_o13 | Great Snakes | 3 | |
| Laingameruwu | Bringing It All Together | 50 | |
| Pockeyhead | Finding Flags | 2 | |
| B0T_o13 | Finding Flags | 2 | |
| C4mpoJUL | Transparency | 50 | |
| AlexMc99 | Great Snakes | 3 | |
| parismcv | Great Snakes | 3 | |
| C4mpoJUL | SSH Keys | 35 | |
| AlexMc99 | Finding Flags | 2 |
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