| Date | User | Challenge | Score |
| NeutralB | Background Reading | 5 | |
| uwualien | Greatest Common Divisor | 15 | |
| Merci_b | ZKP Introduction | 5 | |
| InRainbows | Deriving Symmetric Keys | 40 | |
| TheLeonidas | Bytes and Big Integers | 10 | |
| jac0 | Generators of Groups | 20 | |
| Merci_b | Jack's Birthday Hash | 20 | |
| jac0 | Working with Fields | 10 | |
| jac0 | Modulus Inutilis | 50 | |
| NioZow | Couples | 100 | |
| Xuuu | Great Snakes | 3 | |
| nallappa | Finding Flags | 2 | |
| 4rg0 | Bytes and Big Integers | 10 | |
| Xuuu | Finding Flags | 2 | |
| Palesword | Modular Inverting | 25 | |
| prxh | Base64 | 10 | |
| Agnumen | Symmetry | 50 | |
| prxh | Hex | 5 | |
| Palesword | Modular Arithmetic 2 | 20 | |
| 4rg0 | Base64 | 10 | |
| RuslanPaputsia | Lazy CBC | 60 | |
| Palesword | Modular Arithmetic 1 | 20 | |
| prxh | ASCII | 5 | |
| HarshVardhan | XOR Starter | 10 | |
| RuslanPaputsia | Flipping Cookie | 60 | |
| jonnytang | Modular Square Root | 35 | |
| prxh | Network Attacks | 5 | |
| jac0 | Salty | 20 | |
| NioZow | Mister Saplin's Preview | 80 | |
| 4rg0 | Hex | 5 | |
| jac0 | Manyprime | 40 | |
| dinhtienluan | XOR Properties | 15 | |
| NioZow | Pairing-Based Cryptography | 50 | |
| Palesword | Extended GCD | 20 | |
| dinhtienluan | XOR Starter | 10 | |
| kennytheclown | ASCII | 5 | |
| dinhtienluan | Bytes and Big Integers | 10 | |
| RuslanPaputsia | ECB CBC WTF | 55 | |
| RuslanPaputsia | Passwords as Keys | 50 | |
| kennytheclown | Great Snakes | 3 | |
| dinhtienluan | Base64 | 10 | |
| CIcigeo | Modular Inverting | 25 | |
| RuslanPaputsia | Modes of Operation Starter | 15 | |
| CIcigeo | Modular Arithmetic 2 | 20 | |
| asddsaqweewq | Base64 | 10 | |
| 4rg0 | ASCII | 5 | |
| CIcigeo | Modular Arithmetic 1 | 20 | |
| dinhtienluan | Hex | 5 | |
| CIcigeo | Extended GCD | 20 | |
| amigo0o | Export-grade | 100 |
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