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Level: 1
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| Mathematics | Legendre Symbol | 35 | |
| Mathematics | Quadratic Residues | 25 | |
| Symmetric Ciphers | Symmetry | 50 | |
| Symmetric Ciphers | Lazy CBC | 60 | |
| Symmetric Ciphers | Flipping Cookie | 60 | |
| Symmetric Ciphers | ECB CBC WTF | 55 | |
| Symmetric Ciphers | Passwords as Keys | 50 | |
| Introduction | Network Attacks | 5 | |
| Symmetric Ciphers | Modes of Operation Starter | 15 | |
| Introduction | Great Snakes | 3 | |
| Introduction | Finding Flags | 2 |
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