| Date | User | Challenge | Score |
| KietwhUIT | Marin's Secrets | 50 | |
| daeman | Modular Arithmetic 2 | 20 | |
| ii76 | Bytes and Big Integers | 10 | |
| 25520948 | Triple DES | 60 | |
| Courtesyl | Bytes and Big Integers | 10 | |
| ouias | Modular Exponentiation | 10 | |
| KietwhUIT | Infinite Descent | 50 | |
| zkrypy | Great Snakes | 3 | |
| JSsec | Extended GCD | 20 | |
| zkrypy | Finding Flags | 2 | |
| KietwhUIT | Endless Emails | 150 | |
| ZacLawliet | Transparency | 50 | |
| Lilinta | Manyprime | 40 | |
| 25520948 | Lazy CBC | 60 | |
| zetelen | Background Reading | 5 | |
| dipsy | You either know, XOR you don't | 30 | |
| SOOYOUNG_SHIN | Finding Flags | 2 | |
| dipsy | Favourite byte | 20 | |
| dipsy | XOR Properties | 15 | |
| Lilinta | Square Eyes | 35 | |
| AlKafr | Favourite byte | 20 | |
| Mstrxna | Finding Flags | 2 | |
| Courtesyl | Base64 | 10 | |
| Lilinta | Monoprime | 30 | |
| 25520948 | Flipping Cookie | 60 | |
| MellivorX | XOR Starter | 10 | |
| Lilinta | Inferius Prime | 30 | |
| willopen | Bytes and Big Integers | 10 | |
| ADDADDA | Deriving Symmetric Keys | 40 | |
| ii76 | Base64 | 10 | |
| ghaisan | Jack's Birthday Confusion | 30 | |
| hippo333 | Favourite byte | 20 | |
| piezuke | Encoding Challenge | 40 | |
| ADDADDA | Computing Shared Secrets | 30 | |
| 25520948 | ECB Oracle | 60 | |
| Courtesyl | Hex | 5 | |
| opig1111 | Base64 | 10 | |
| Courtesyl | ASCII | 5 | |
| ii76 | Hex | 5 | |
| sangmyeongsheon | Structure of AES | 15 | |
| AlKafr | XOR Properties | 15 | |
| Lilinta | Transparency | 50 | |
| ghaisan | Jack's Birthday Hash | 20 | |
| Rochlator | Great Snakes | 3 | |
| Courtesyl | Great Snakes | 3 | |
| Courtesyl | Finding Flags | 2 | |
| Mitesh_Bhudia | Quadratic Residues | 25 | |
| Mitesh_Bhudia | Modular Inverting | 25 | |
| Mitesh_Bhudia | Modular Arithmetic 2 | 20 | |
| Mitesh_Bhudia | Modular Arithmetic 1 | 20 |
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