yihengyap
Solves
| Challenge | Category | Value | Time |
| I am Samuel Morse! | Cryptography | 100 | |
| Julius Caesar | Cryptography | 100 | |
| I am Samuel Morse 2! | Cryptography | 200 | |
| Year 1993 by Urban Müller | Cryptography | 300 | |
| IQ Test | Cryptography | 20 | |
| Beware of SHA1rk | Cryptography | 20 | |
| What is ROT? | Cryptography | 50 | |
| Simple RSA | Cryptography | 20 | |
| Simple RSA 2 | Cryptography | 20 | |
| Small-E | None | 20 |