shao0421
Solves
| Challenge | Category | Value | Time |
| Warm Up | Warm Up | 20 | |
| Base64 | Warm Up | 20 | |
| QR | Warm Up | 20 | |
| Secure Shell | Warm Up | 20 | |
| Year 1993 by Urban Müller | Cryptography | 300 | |
| Julius Caesar | Cryptography | 100 | |
| Beware of SHA1rk | Cryptography | 20 | |
| Simple RSA | Cryptography | 20 | |
| Simple RSA 2 | Cryptography | 20 | |
| Simple Diffie-Hellman | None | 20 | |
| Simple Diffie-Hellman 2 | None | 20 | |
| Wiener's RSA | None | 20 | |
| Fermat's RSA | None | 20 | |
| Small-E | None | 20 | |
| SKR Lang | Cryptography | 20 | |
| Small-E 2 | None | 20 | |
| I am Samuel Morse! | Cryptography | 100 | |
| I am Samuel Morse 2! | Cryptography | 200 | |
| De Tuna My Fish | Cryptography | 20 | |
| File Signature | Forensics | 20 |