Hey there! We have a gift for you 😏
Hi! I am Gareth, aka grhkm online. Hongkonger 🇭🇰 and currently studying maths at University of Warwick 🇬🇧. Interested in maths, cryptography (abbr. crypto), rhythm games and all kinds of music. As a typical maths student, I am not sure what my future career will be. Maybe cryptography researcher? Software engineer? …? Please message me if you have any advice 😅.
This blog mainly contains writeups for interesting CTF and other algorithmic problems, but I plan to write some random blogs as well (someone suggested a song recommendation blog).
Some random facts about me…
- I’m a Once.
- #1 HK, #1 HK / #29 Global, #49 HK
- Missed a chance to join the HKOI team because my CS teacher didn’t sign me up for the competition and there was nothing I can do.
Not sure where to start? Check out these articles:
- Lagrange Interpolation, pt. 1 and 2
- DiceCTF LWE
- hkcert Unobserved Box
If you like my blog, you might also like…
- Mystiz’s Blog: https://mystiz.hk/
- Mystiz is an experienced member of Black Bauhinia (many more years of experience than me). I thought he is good at crypto but he is definitely more than that.
- Just kidding, I first met him on Cryptohack where he invited me to his Hong Kong CTF team. I am very fortunate to have met him (virtually for now). Can’t wait to solve more CTF problems and continue vibing together!
- kurenaif’s Channel: https://www.youtube.com/c/kurenaif
- She makes really high quality videos on crypto, pwn/vulnerabilities, web, and more. I first learned and understood lattice-based attacks from her video. Be sure to check it out!
- rkm0959’s Blog: https://rkm0959.tistory.com/category/CTF
- He has some really high quality writeups, and every crypto player should read his article named “Inequality Solving with CVP”.
- Cousin’s Blog: https://klwu.co/
- Also known as the Kirby guy, he has many well-explained articles on Elliptic Curves and Lattice-based Cryptography. He has a cool demonstration of the Babai’s algorithm here.