yipzhihong
Solves
| Challenge | Category | Value | Time |
| Net Cat | Warm Up | 20 | |
| Julius Caesar | Cryptography | 100 | |
| Year 1993 by Urban Müller | Cryptography | 300 | |
| I am Samuel Morse! | Cryptography | 100 | |
| Beware of SHA1rk | Cryptography | 20 |
| Challenge | Category | Value | Time |
| Net Cat | Warm Up | 20 | |
| Julius Caesar | Cryptography | 100 | |
| Year 1993 by Urban Müller | Cryptography | 300 | |
| I am Samuel Morse! | Cryptography | 100 | |
| Beware of SHA1rk | Cryptography | 20 |