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title
Cocousin = Usin
description
The personal website for Wu “Cousin” Ka Lok. The place for blogs and write-ups to CTF challenges that he finds interesting.
image
site name
Cocousin = Usin
author
Cousin Wu Ka Lok
updated
2025-12-16 08:49:27
raw text
Cocousin = Usin Skip to primary navigation Skip to content Skip to footer Cocousin = Usin About Maths in Crypto Demo Writeups Tags Toggle search Toggle menu Cousin Wu Ka Lok First-year PhD student in the Computer Science Department at Stony Brook University. CTF, Maths enthusiast. A member of the Black Bauhinia (blackb6a) CTF team based in Hong Kong. Follow Stony Brook, NY Website GitHub Email The personal website for Wu "Cousin" Ka Lok (also known as Cosine, usin, …). This website contains blogs and write-ups to CTF challenges that I find interesting. I would also like to share the mathematics behind cryptography, and how the designed may be exploited for attacks. I also made some visualizations of (sometimes seemingly abstract) mathematical concepts. Recent posts Fundamental Concepts Underlying Elliptic Curves (Level 2): Divisors and Pairings 11 May, 2022 56 minute read ★★★☆☆ Elliptic curve has a lot ...
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